Rename pytest_plugins to ipatests.pytest_ipa

pytest 3.7.0 doesn't like ipatests.pytest_plugins package. The string
"pytest_plugins" is used as marker to load plugins. By populare vote and
to avoid future conflicts, we decided to rename the directory to pytest_ipa.

Fixes: https://pagure.io/freeipa/issue/7663
Signed-off-by: Christian Heimes <cheimes@redhat.com>
Reviewed-By: Alexander Bokovoy <abokovoy@redhat.com>

ipatests/test_integration/test_testconfig.py

@@ -20,7 +20,7 @@
 import json
 import copy
 
-from ipatests.pytest_plugins.integration import config
+from ipatests.pytest_ipa.integration import config
 from ipapython.ipautil import write_tmp_file
 from ipatests.util import assert_deepequal
 from ipalib.constants import MAX_DOMAIN_LEVEL