Should still be sufficient for ERP5 unit tests: largest test uses 3 DB, and
we want to run 10 tests in parallel.

vincent: Minor fixes. Move branch switch to a separate commit.

otherwise it will be invokec by supervisord.

with this, we can manually disable/enable a backend node so that we
can safely restart it.

because webrunner uses only one IPv4 local address.

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

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

because slapos.zcbworkarounds is a part of buildout extensions.

This reverts commit 061a05cd.

This reverts commit 4dba26ff.

This should have been part of 55f915c3

This reverts commit 781c1a44.
Extended .cfg files are not cooperating, so += is unusable in [buildout]
section, even for find-links.

Conflicts:
	stack/erp5/buildout.cfg
(cherry picked from commit b4085e58)

This reverts commit 781c1a44.
Extended .cfg files are not cooperating, so += is unusable in [buildout]
section, even for find-links.

Conflicts:
	stack/erp5/buildout.cfg