Added tests for client certificate authentication

integration/fixtures/https/clientca/client2.key

@@ -0,0 +1,27 @@
+-----BEGIN RSA PRIVATE KEY-----
+MIIEpQIBAAKCAQEA9LaFxeiG1qpBTUIEl2vxvojOSWR1xkayaGtGsXBuqucfwifu
+lsVC7dw+t7lW42pWutIuR98iflAZ9+tFX7TsEITNIyV64ePn9TF935LW2DFmAFkq
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++jir0biBAoGBAPutA9/2yo/fchRWLgpsWZ1SLXRWewFYqxlA7DluYXvqciYCXuKe
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+fgoCyCahp2BnVCp7Gm3B/AzeZlH7n23qvbkJOsKGuocDycR9TIud+fk=
+-----END RSA PRIVATE KEY-----