If the administrator has set gerrit.canonicalGitUrl but has left the download.scheme variable unset to its default, assume they want to use git:// as a type of download and enable it. Bug: issue 966 Change-Id: I8f6d5c5a3d16821d07c61f16bce9680a7e0721e5 Signed-off-by: Shawn O. Pearce <sop@google.com>