xenapi: Stub out entry points for BitTorrent tests

This will make the test case play nicer when there is no virtual
environment.

Change-Id: Id7dbea8263295aedc4d9a72cc8a42762307a280b
Merge "xenapi: Stub out entry points for BitTorrent tests"
Merge remote-tracking branch 'm_src_repo/citrix-fixes' into build-temp