Add test for pki-server instance-externalcert-add/del #5662

Job	Run time
Update Version / Test	16s
Waiting for build / Waiting For Build	5m 39s
PKICertImport / Test	1m 17s
PKI NSS CLI with AES / Test	43s
PKI NSS CLI with ECC / Test	52s
PKI NSS CLI with Extensions / Test	36s
PKI NSS CLI with HSM / Test	1m 6s
PKI PKCS11 CLI / Test	1m 1s
PKI NSS CLI with RSA / Test	46s
PKI PKCS7 CLI / Test	50s
PKI PKCS12 CLI / Test	44s
rpminspect / Test	5m 56s
	19m 46s

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