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_custodia.py

@@ -164,7 +164,7 @@ def main():
     with redirect_stdout(ansible_log):
         ansible_log.debug("-- INSTALL_CUSTODIA --")
 
-        if NUM_VERSION < 40690:
+        if not hasattr(custodiainstance, "get_custodia_instance"):
             custodia = custodiainstance.CustodiaInstance(config.host_name,
                                                          config.realm_name)
             if promote: