Enable docker acceptance tests
Enable docker acceptance tests

We want to ensure diego_docker feature is still working. Enable acceptance
tests for that. These will be run on CI for every merge to master.

alphagov/paas-cf,alphagov/paas-cf,alphagov/paas-cf,alphagov/paas-cf,alphagov/paas-cf,alphagov/paas-cf,alphagov/paas-cf,alphagov/paas-cf