Add support for new Gerrit features

Since 2.8 Gerrit supports the additional attribute
--max-object-size-limit for the create-project command.

Since 2.9 Gerrit supports the additional attribute
--plugin-config for the create-project command.

Change-Id: I757d074ec9f45339a0a316d198b76b290ac9dd1b
Signed-off-by: Michael Ochmann <michael.ochmann@sap.com>
3 files changed