api: support SSL private key file decryption #3171

Job	Run time
run-tests-ce (1.13, 1.10, false, false)	5m 2s
run-tests-ce (1.13, 2.8, false, false)	6m 36s
run-tests-ce (1.13, 2.10, false, false)	6m 41s
run-tests-ce (1.13, 2.x-latest, false, false)	15m 13s
run-tests-ce (2.x-latest, true, 1.13)	23m 36s
run-tests-ce (2.x-latest, true, 1.18, false)	19m 9s
run-tests-ee (bundle-1.10.11-0-gf0b0e7ecf-r470, false, false, false)	5m 39s
run-tests-ee (bundle-2.10.0-1-gfa775b383-r486-linux-x86_64, false, true)	5m 35s
run-tests-ee (sdk-gc64-2.11.0-0-r577.linux.x86_64, true, true, release/linux/x86_64/2.11/)	8m 58s
testing_mac_os (1.13, macos-11, brew)	8m 41s
testing_mac_os (1.13, macos-11, 1.10.14)	7m 49s
testing_mac_os (1.13, macos-12, brew)	8m 14s
testing_mac_os (1.13, macos-12, 1.10.14)	6m 52s
	2h 8m 5s

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