Bootstrap bosh pipeline in init job.
Bootstrap bosh pipeline in init job.

This makes the pipeline simpler and more consistent with other
pipelines.

This also pins vpc-tfstate for the generate-bosh-manifest job to the
bosh-terraform job to guarantee that it uses a version of the vpc state
that matches the bosh state it's using.

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