Fix a typo of python-cinderclient GITBRANCH

A left out N. Causes various failures in shell evaluation.

Change-Id: Icc09998c645ef2b975cb24b56d0f71c60289c188
Merge "Fix a typo of python-cinderclient GITBRANCH"
Merge branch 'master' of https://github.com/openstack-dev/devstack