Add admin command "gerrit replicate" to force resync a project

This can be useful to force a project to resync, such as after
detecting a mirror failure and the mirror has been recovered,
or if a ref was deleted from the main project by hand, and it
must be delivered to the mirrors.

Bug: GERRIT-110
Signed-off-by: Shawn O. Pearce <sop@google.com>
5 files changed