Unit tests: use ".invalid" domain name for OCSP responder

to make DNS lookup fail faster.

Reviewed-by: Sumit Bose <[email protected]>

src/tests/test_CA/SSSD_test_cert_0005.config

@@ -18,4 +18,4 @@ subjectKeyIdentifier = hash
 keyUsage = critical, nonRepudiation, digitalSignature, keyEncipherment
 extendedKeyUsage = clientAuth
 subjectAltName = email:[email protected],URI:https://github.com/SSSD/sssd//
-authorityInfoAccess = OCSP;URI:http://ocsp.my.server.test/
+authorityInfoAccess = OCSP;URI:http://ocsp.my.server.invalid/