Refactor CertificateAuthority.signOCSPResponse() #4482

Job	Run time
Waiting for build / Waiting For Build	5m 42s
Update Version / Test	16s
PKICertImport / Test	1m 29s
PKI NSS CLI with ECC / Test	45s
PKI NSS CLI with RSA / Test	52s
PKI NSS CLI with AES / Test	35s
PKI NSS CLI with Extensions / Test	52s
PKI PKCS7 CLI / Test	56s
PKI PKCS11 CLI / Test	1m 45s
PKI PKCS12 CLI / Test	54s
PKI NSS CLI with HSM / Test	1m 33s
rpminspect / Test	8m 1s
	23m 40s

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