test_xmlrpc: Use absolute imports

In Python 3, a module from the current package can be imported
either with the absolute name or by using an explicit relative import.

Part of the work for https://fedorahosted.org/freeipa/ticket/4985

Reviewed-By: Martin Basti <mbasti@redhat.com>
Reviewed-By: Petr Spacek <pspacek@redhat.com>

ipatests/test_xmlrpc/test_add_remove_cert_cmd.py

@@ -4,14 +4,14 @@
 
 import base64
 
-from ipalib import api, errors
-
-from ipatests.util import assert_deepequal, raises
-from xmlrpc_test import XMLRPC_test
-from ipapython.dn import DN
-from testcert import get_testcert
 import pytest
 
+from ipalib import api, errors
+from ipapython.dn import DN
+from ipatests.util import assert_deepequal, raises
+from ipatests.test_xmlrpc.xmlrpc_test import XMLRPC_test
+from ipatests.test_xmlrpc.testcert import get_testcert
+
 
 @pytest.mark.tier1
 class CertManipCmdTestBase(XMLRPC_test):

ipatests/test_xmlrpc/test_user_plugin.py

@@ -33,7 +33,7 @@ from ipalib import api, errors
 from ipatests.test_xmlrpc import objectclasses
 from ipatests.util import (
     assert_deepequal, assert_equal, assert_not_equal, raises)
-from xmlrpc_test import (
+from ipatests.test_xmlrpc.xmlrpc_test import (
     XMLRPC_test, fuzzy_digits, fuzzy_uuid, fuzzy_password,
     fuzzy_string, fuzzy_dergeneralizedtime, add_sid, add_oc, raises_exact)
 from ipapython.dn import DN