Upgrade buildbot master version to the latest release

In order to keep running the CI system, we must update Buildbot to a new version. This task comes with the following difficulties:

1. Complete refactoring of the grid view in a newer version of Buildbot
   • This impacts the UI that developers see (no longer showing which tests actually fail)
2. No more support for MTR log observer
   • MTR log observer is no longer part of buildbot source code. This impacts the crossreference plugin as it is the functionality required to push failed test cases, and their output to the cross-reference database.
3. Potential backwards incompatible changes in the configuration steps, although this is not significantly likely.

The first two items are blockers for this task and will have to be addressed before a version update is possible.