[FFe][focal] kronosnet need fixes from just released upstream version

# Feature Freeze Exception - kronosnet

[Proposed Changes]

* Merge from v1.14 to v1.15.

* Main release is almost entirely about bug fixes.

From Highlights:

- Fix UDP socket options that could lead to knet not being properly functional
- Man pages updates
- Minor bug fixes

* 2 commits were a doubt - about being new features - during merge review:

From Highlights:

- Fix major interaction issues between applications gathering statistics and PMTUd.

https://code.launchpad.net/~rafaeldtinoco/ubuntu/+source/kronosnet/+git/kronosnet/+merge/381356/comments/1001053

[Rationale for Exception]

* Kronosnet has become one of the most important parts of corosync lately, as
it is the main underlying network protocol used by corosync when it comes to
supporting multiple network rings simultaneously.

[Additional Information]

# Merge attempt reviewed

https://code.launchpad.net/~rafaeldtinoco/ubuntu/+source/kronosnet/+git/kronosnet/+merge/381356

# PPA where I made tests

https://launchpad.net/~ubuntu-server-ha/+archive/ubuntu/staging

# All HA tests are being conducted on each change in a similar scenario:

https://discourse.ubuntu.com/t/ubuntu-high-availability-shared-scsi-disk-environments/14874

using the HA staging PPA (containing this new merge)

# Original Description

All,

We are pleased to announce the general availability of kronosnet v1.15

kronosnet (or knet for short) is the new underlying network protocol for
Linux HA components (corosync), that features the ability to use
multiple links between nodes, active/active and active/passive link
failover policies, automatic link recovery, FIPS compliant encryption
(nss and/or openssl), automatic PMTUd and in general better performance
compared to the old network protocol.

Highlights in this release:

* Fix major interaction issues between applications gathering statistics
   and PMTUd.
* Fix UDP socket options that could lead to knet not being properly
   functional
* Man pages updates
* Minor bug fixes

Known issues in this release:

* none

The source tarballs can be downloaded here:

https://www.kronosnet.org/releases/

Upstream resources and contacts:

https://kronosnet.org/
https://github.com/kronosnet/kronosnet/
https://ci.kronosnet.org/
https://trello.com/kronosnet (TODO list and activities tracking)
https://goo.gl/9ZvkLS (google shared drive with presentations and diagrams)
IRC: #kronosnet on Freenode
https://lists.kronosnet.org/mailman/listinfo/users
https://lists.kronosnet.org/mailman/listinfo/devel
https://lists.kronosnet.org/mailman/listinfo/commits

Cheers,
The knet developer team

----

To be honest, we are so close to v1.15 that I think we should just merge latest:

cd916c4 [stats] allow knet_link_get_status to operate in readlock context
86e0560 [stats] allow knet_handle_get_stats to operate in a readlock context
41f5a2a [rx] kill unused variable
e61d086 [tests] rework test suite link port allocation
e90cf36 [transports] use SO_REUSEADDR only for sctp
fcbeda8 [man] Enhance prio description of POLICY_PASSIVE
3ba5ddf man: Change strcat to strncat
ed7573d man: Fix covscan reports in doxyxml.c

As it does not seem to need a freeze exception.