Allow to use refspec shortcuts for push replication

Documentation states [1] that one can use a short refspec for 'push'
replication. This fix actually makes it possible.

1) http://gerrit.googlecode.com/svn/documentation/2.0/config-replication.html

Bug: issue 658
Change-Id: Icbd61088ddac2ad627267bd7cf6a620498a00bf7
[cherry-picked from 47be12b9f3b74ef0b4d36d47b4a34deebe568e55]
Change-Id: I57feb280bef7b89d51a313f160ea383ce4495294
1 file changed