Serialize generate-cf-certs to prevent parallel runs
Serialize generate-cf-certs to prevent parallel runs

We have noticed that generate-cf-certs is missing serial groups
parameter that ensures serial execution of jobs in 'deploy' group. That
caused generate-cf-certs job to run in parallel with other jobs in some
edge case circumstances.

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