Tasks before 10.0.4-release

This task will have as a subtasks all tasks that we intend to fix for 10.0.4 release. We are not using the "version" feature from Jira because we're unable to get a small list of tasks.

• Failures of "upgrade" tests in buildbot are not a problem for this release (the failures are caused by InnoDB's inability to start on 5.1's datadir)
• Currently, all failing tests in buildbot are random. There are two kind of failures
  • "big" tests fail due to timeout
  • replication test failures (it is suspected that the problem is in the tests, not in the features being tested)
• sol10-64 fails to compile. Is this a problem for making packages (ask Wlad or Daniel)
• It seems, we don't need a merge from 5.5. We don't need a merge from 10.0-base
• Elena is going through 5.6 changelogs and checking if a feature was merged/non-merged or partially merged. ETA is Saturday.
  Upd by Elena:
  • Added a list of new features, found during the first iteration through the release notes ("Changes" sections), to MDEV-4874 (as a comment);
  • Filed noticed problems as bugs, linked it to this task;
  • Now will be going through "Bugfixes" sections, since the distribution of items between "Changes" and "Bugfixes" is rather arbitrary, ETA unknown yet