Release 19.1

This bug tracks cloud-init upstream release of version 19.1.

== Release Notes ==
Hello All,

Cloud-init release 19.1 is now available

The 19.1 release:
 * spanned just under 5 months in length
 * had 24 contributors from 20 domains
 * fixed 30 launchpad issues

Highlights:
 - Azure datasource telemetry, network configuration and ssh key hardening
 - new config module for interacting with third party drivers on Ubuntu
 - EC2 Classic instance support for network config changes across reboot
 - Add support for the com.vmware.guestInfo OVF transport.
 - Scaleway: Support ssh keys provided inside an instance tag.
 - Better NoCloud support for case-insensitive fs labels.

== Changelog ==

  - tests: add Eoan release [Paride Legovini]
  - cc_mounts: check if mount -a on no-change fstab path
    [Jason Zions (MSFT)] (LP: #1825596)
  - replace remaining occurrences of LOG.warn [Daniel Watkins]
  - DataSourceAzure: Adjust timeout for polling IMDS [Anh Vo]
  - Azure: Changes to the Hyper-V KVP Reporter [Anh Vo]
  - git tests: no longer show warning about safe yaml.
  - tools/read-version: handle errors [Chad Miller]
  - net/sysconfig: only indicate available on known sysconfig distros
    (LP: #1819994)
  - packages: update rpm specs for new bash completion path
    [Daniel Watkins] (LP: #1825444)
  - test_azure: mock util.SeLinuxGuard where needed
    [Jason Zions (MSFT)] (LP: #1825253)
  - setup.py: install bash completion script in new location [Daniel Watkins]
  - mount_cb: do not pass sync and rw options to mount
    [Gonéri Le Bouder] (LP: #1645824)
  - cc_apt_configure: fix typo in apt documentation [Dominic Schlegel]
  - Revert "DataSource: move update_events from a class to an instance..."
    [Daniel Watkins]
  - Change DataSourceNoCloud to ignore file system label's case.
    [Risto Oikarinen]
  - cmd:main.py: Fix missing 'modules-init' key in modes dict
    [Antonio Romito] (LP: #1815109)
  - ubuntu_advantage: rewrite cloud-config module
  - Azure: Treat _unset network configuration as if it were absent
    [Jason Zions (MSFT)] (LP: #1823084)
  - DatasourceAzure: add additional logging for azure datasource [Anh Vo]
  - cloud_tests: fix apt_pipelining test-cases
  - Azure: Ensure platform random_seed is always serializable as JSON.
    [Jason Zions (MSFT)]
  - net/sysconfig: write out SUSE-compatible IPv6 config [Robert Schweikert]
  - tox: Update testenv for openSUSE Leap to 15.0 [Thomas Bechtold]
  - net: Fix ipv6 static routes when using eni renderer
    [Raphael Glon] (LP: #1818669)
  - Add ubuntu_drivers config module [Daniel Watkins]
  - doc: Refresh Azure walinuxagent docs [Daniel Watkins]
  - tox: bump pylint version to latest (2.3.1) [Daniel Watkins]
  - DataSource: move update_events from a class to an instance attribute
    [Daniel Watkins] (LP: #1819913)
  - net/sysconfig: Handle default route setup for dhcp configured NICs
    [Robert Schweikert] (LP: #1812117)
  - DataSourceEc2: update RELEASE_BLOCKER to be more accurate
    [Daniel Watkins]
  - cloud-init-per: POSIX sh does not support string subst, use sed
    (LP: #1819222)
  - Support locking user with usermod if passwd is not available.
  - Example for Microsoft Azure data disk added. [Anton Olifir]
  - clean: correctly determine the path for excluding seed directory
    [Daniel Watkins] (LP: #1818571)
  - helpers/openstack: Treat unknown link types as physical
    [Daniel Watkins] (LP: #1639263)
  - drop Python 2.6 support and our NIH version detection [Daniel Watkins]
  - tip-pylint: Fix assignment-from-return-none errors
  - net: append type:dhcp[46] only if dhcp[46] is True in v2 netconfig
    [Kurt Stieger] (LP: #1818032)
  - cc_apt_pipelining: stop disabling pipelining by default
    [Daniel Watkins] (LP: #1794982)
  - tests: fix some slow tests and some leaking state [Daniel Watkins]
  - util: don't determine string_types ourselves [Daniel Watkins]
  - cc_rsyslog: Escape possible nested set [Daniel Watkins] (LP: #1816967)
  - Enable encrypted_data_bag_secret support for Chef
    [Eric Williams] (LP: #1817082)
  - azure: Filter list of ssh keys pulled from fabric [Jason Zions (MSFT)]
  - doc: update merging doc with fixes and some additional details/examples
  - tests: integration test failure summary to use traceback if empty error
  - This is to fix https://bugs.launchpad.net/cloud-init/+bug/1812676
    [Vitaly Kuznetsov]
  - EC2: Rewrite network config on AWS Classic instances every boot
    [Guilherme G. Piccoli] (LP: #1802073)
  - netinfo: Adjust ifconfig output parsing for FreeBSD ipv6 entries
    (LP: #1779672)
  - netplan: Don't render yaml aliases when dumping netplan (LP: #1815051)
  - add PyCharm IDE .idea/ path to .gitignore [Dominic Schlegel]
  - correct grammar issue in instance metadata documentation
    [Dominic Schlegel] (LP: #1802188)
  - clean: cloud-init clean should not trace when run from within cloud_dir
    (LP: #1795508)
  - Resolve flake8 comparison and pycodestyle over-ident issues
    [Paride Legovini]
  - opennebula: also exclude epochseconds from changed environment vars
    (LP: #1813641)
  - systemd: Render generator from template to account for system
    differences. [Robert Schweikert]
  - sysconfig: On SUSE, use STARTMODE instead of ONBOOT
    [Robert Schweikert] (LP: #1799540)
  - flake8: use ==/!= to compare str, bytes, and int literals
    [Paride Legovini]
  - opennebula: exclude EPOCHREALTIME as known bash env variable with a
    delta (LP: #1813383)
  - tox: fix disco httpretty dependencies for py37 (LP: #1813361)
  - run-container: uncomment baseurl in yum.repos.d/*.repo when using a
    proxy [Paride Legovini]
  - lxd: install zfs-linux instead of zfs meta package
    [Johnson Shi] (LP: #1799779)
  - net/sysconfig: do not write a resolv.conf file with only the header.
    [Robert Schweikert]
  - net: Make sysconfig renderer compatible with Network Manager.
    [Eduardo Otubo]
  - cc_set_passwords: Fix regex when parsing hashed passwords
    [Marlin Cremers] (LP: #1811446)
  - net: Wait for dhclient to daemonize before reading lease file
    [Jason Zions] (LP: #1794399)
  - [Azure] Increase retries when talking to Wireserver during metadata walk
    [Jason Zions]
  - Add documentation on adding a datasource.
  - doc: clean up some datasource documentation.
  - ds-identify: fix wrong variable name in ovf_vmware_transport_guestinfo.
  - Scaleway: Support ssh keys provided inside an instance tag. [PORTE Loïc]
  - OVF: simplify expected return values of transport functions.
  - Vmware: Add support for the com.vmware.guestInfo OVF transport.
    (LP: #1807466)
  - HACKING.rst: change contact info to Josh Powers
  - Update to pylint 2.2.2.