ipareplica: Do no use IPA version to check for get_custodia_instance existance

The use of IPA versions to determine if get_custodia_instance should be
used was not optimal as the patch that introduced this has been back-ported
to the EL-7 package with verion 4.5.4. As get_custodia_instance was not
available before we can simply check if get_custodia_instance exists in
custodiainstance.

roles/ipareplica/library/ipareplica_setup_ca.py

@@ -209,7 +209,8 @@ def main():
         options.domain_name = config.domain_name
         options.host_name = config.host_name
         options.dm_password = config.dirman_password
-        if NUM_VERSION < 40690:
+
+        if not hasattr(custodiainstance, "get_custodia_instance"):
             ca.install(False, config, options)
         else:
             if ca_enabled: