
We were getting errors locally [0] that complained about libpq-dev not being installed. This was causing os_tempest plugins installations to fail, snowballing the run. This commit adds libpq-dev to the ubuntu 16.04 variables so that we ensure it's installed before we get to that step. [0] http://cdn.pasteraw.com/1sdkssty5uvgq315hj7g5lvwpm8xyob Change-Id: I82eb012ac9d3a630e072e6b873419b86fa39333b