v2.x - Allow SP certificates to be OpenSSL::X509::Certificate / private_key to be OpenSSL::PKey::PKey #406

Job	Run time
rubocop	10s
Unit test (ubuntu-20.04, 3)	1m 48s
Unit test (ubuntu-20.04, 3.1)	1m 49s
Unit test (ubuntu-20.04, 3.2)	1m 43s
Unit test (ubuntu-20.04, 3.3)	1m 49s
Unit test (ubuntu-20.04, jruby-9.4)	2m 27s
Unit test (ubuntu-20.04, truffleruby)	3m 42s
Unit test (macos-latest, 3)	1m 38s
Unit test (macos-latest, 3.1)	1m 33s
Unit test (macos-latest, 3.2)	1m 34s
Unit test (macos-latest, 3.3)	1m 38s
Unit test (macos-latest, jruby-9.4)	2m 0s
Unit test (macos-latest, truffleruby)	2m 45s
Unit test (windows-latest, 3)	3m 14s
Unit test (windows-latest, 3.1)	3m 17s
Unit test (windows-latest, 3.2)	2m 39s
Unit test (windows-latest, 3.3)	4m 31s
finish	4s
	38m 21s

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