Updated openstack/openstack
Project: openstack-dev/pbr  d6d5f1712c3661c8f8822c6d02b9a0e71c1370f4
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Make tools/integration.sh take a branch

Instead of always using master branch support the option to use stable
branches. Read the branch via the $OVERRIDE_ZUUL_BRANCH environmental
variable that devstack-gate sets

Change-Id: Iab4ae1efddc4dca38dcd3779dae1a79ddc2b0852