Aaron Sheffield 12de088b9d Updating Docker Gate use of zuul.newrev
- Zuul updated ansible to 2.7, no longer allows missing variables.
- Using default value when it isn't available.

Based on Aaron Sheffield's PS for Pegleg: https://review.openstack.org/#/c/645631/

Change-Id: I02495bc793021b429e0be62ecac0ed45e930484c
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