Ask for commit-message on current-patchset

When querying for current-patchset, commit message
is not provided (at least in gerrit 2.4)
Specify the commit-message flag in that case, to
provide it and allow zuul to run safely on 2.4 version.

Change-Id: I75ad488d35a3ebeb1a6ad0c54dadb6b398f6aba5
1 file changed