Add test for CA container system service #4926

Job	Run time
Building ACME images	6m 15s
Publishing ACME images	0s
ACME with certbot / Test	9m 28s
ACME container / Test	1m 38s
ACME with postgresql back-end / Test	4m 42s
ACME server switchover / Test	3m 55s
	25m 58s

Provide feedback