provide command for preparing for reboot (only)

This is implemented now with http://anonscm.debian.org/cgit/autopkgtest/autopkgtest.git/commit/?id=fb256726aead3 (and a handful of previous commits for preparation). I also updated https://people.debian.org/~mpitt/autopkgtest/README.package-tests.html with an explanation and an example. Let me know how that works for you!

Until this is in wily, feel free to just check out git and use ./run-from-checkout instead of adt-run.

This bug was fixed in the package autopkgtest - 3.14

---------------
autopkgtest (3.14) unstable; urgency=medium

  Improvements:
  * adt-virt-ssh: Add --reboot option to indicate that testbed can be
    rebooted. This is useful when running without a setup script (which can
    already declare capabilities).
  * Simplify reboot implementation: Just call "reboot" as root in the testbed
    to trigger rebooting, and replace the former hook_reboot() in adt-virt-*
    with hook_wait_reboot() which merely waits for the testbed to go down and
    come back up. This also replaces the "reboot" command for ssh setup
    scripts to "wait-reboot" and in most cases it is not needed to implement
    this at all (except for the "adb" script).
  * Add /tmp/autopkgtest-reboot-prepare script for testbeds which support
    rebooting. This saves the current state but leaves the actual reboot to
    the test itself. This is useful if rebooting should happen with unusual
    means (e. g. kexec) or as part of testing something else (like a system
    upgrade). (LP: #1445819)
  * Log complete command line invocation, for easier local reproduction,
    comparison of log files, and clarifying which options were used.
    (LP: #1449413)

  Bug fixes:
  * Update Vcs-Git: field for anonscm.debian.org.
  * Drop obsolete XS-Testsuite: control field.
  * adt-setup-vm: Fix script error if $ADT_SETUP_VM_POST_COMMAND is not set.
  * README.click-tests.rst: Describe x-source manifest entry.
  * Mark test dependencies as manually installed, so that they don't go away
    if a test calls "apt-get autoremove".
  * Set DEBIAN_FRONTEND=noninteractive for tests. This avoids stderr messages
    about "unable to open stdin" and similar when tests call apt-get install.

 -- Martin Pitt <email address hidden> Tue, 05 May 2015 10:14:23 +0200