Revert merging 'introduce-adapter of git://github.com/MichaelMayorov/buildbot".

This code isn't at the point where somebody could add a seperate protocol
without any core changes, yet.

This reverts commits 9f313d732025406e2cdfdf159d06d1441ed756d7,
aa89b68919034a4dc943291ea12d33ef4533cbbe, and
85fb85358df8974abe56d7beb369194a699f21c9.