Certificates: add missing alternative_names
Certificates: add missing alternative_names

policy_server_asg_syncer_cc_client does not have any alternative_names
defined.

As-per https://github.com/alphagov/paas-cf/commit/f78080:

> In Go 1.15, treating the CommonName field of an x.509 certificate as
a host name when no Subject Alternative Name is present is
deprecated[1]. As a result, cf-deployment >= v14.0.0 has added SAN's
to all of their certificates.

> [1] https://golang.org/doc/go1.15#commonname

cloudfoundry/cf-deployment,cloudfoundry/cf-deployment