Refactor NSSCertRequestCLI #5573

Job	Run time
Building ACME images	4m 46s
Publishing ACME images	1m 3s
Basic ACME / Test	3m 57s
ACME with existing NSS database / Test	4m 18s
ACME container / Test	1m 29s
ACME with postgresql back-end / Test	5m 3s
ACME on separate instance / Test	4m 25s
ACME server switchover / Test	3m 54s
	28m 55s

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