our specified revision seems to be disappeared maybe by force push.

Old versions of slapproxy/slapos master don't know it.
Catching it here so that we have a chance to debug problems in SRs.

Tests directory of inserted paths also needs to be in sys.path so that tests
can import other tests.

Was only used for specific demo.

because slapos.zcbworkarounds is a part of buildout extensions.