create-project: Add --permissions-only option

The new --permissions-only option permits creating a project only
for use as a parent of other projects, for permissions inheritance.
This bypasses the creation of an otherwise empty git repository in
the server's repository forest.

Bug: issue 613
Change-Id: I86c53b11597a3d0cddfae01b2195944b458727a1
Signed-off-by: Shawn O. Pearce <sop@google.com>
2 files changed