openstack-ardana-gerrit: gerrit review script
openstack-ardana-gerrit: gerrit review script

Implemented a script which can be called to post reviews
on Gerrit changes. The script uses pygerrit2 [1] and requires
an HTTP Gerrit username/password to be added to the `.netrc`
file [2]. Using the script is as simple as running:

  ./gerrit_review.py --label 'Code-Review' --vote +1 --message 'LGTM' 1234

[1] https://github.com/dpursehouse/pygerrit2
[2] https://github.com/dpursehouse/pygerrit2#usage

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