Allow concourse jobs connect to concourse ELB
Allow concourse jobs connect to concourse ELB

In the self update pipeline, we need jobs in concourse to be able
to connect to concourse itself.

This commit adds the concourse public IP in the list of IPs allowed to
connect to it.

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