tests: Bring pyro4 protocol back to work as opt in.

vcs: Send custom repo-locked status code to the VCSServer.

tests: Make test work with either http or pyro4 protocol.

vcs: Add a comment about removing some code when dropping Pyro4 support.

vcs: Include reason phrase from VCSServer into HTTP status string.

pytest: Fix settings in test-ini files.

tests: Fix test that expects the pyro4 scm app as default.

tests: Fix path in pytest ini.

tests: Use http backend in rhodecode test ini file.

tests: Create new config files for vcsserver (http/pyro4)