Remove nailgun entity_mixin import from discovery test

Signed-off-by: Gaurav Talreja <gtalreja@redhat.com>

robottelo/config/__init__.py

@@ -90,15 +90,26 @@ def get_url():
     return urlunsplit((scheme, hostname, '', '', ''))
 
 
-def user_nailgun_config(username=None, password=None):
+def default_nailgun_config():
     """Return a NailGun configuration file constructed from default values.
 
     :param user: The ```nailgun.entities.User``` object of an user with additional passwd
         property/attribute
 
     :return: ``nailgun.config.ServerConfig`` object, populated from user parameter object else
         with values from ``robottelo.config.settings``
+    """
+    return ServerConfig(get_url(), get_credentials(), verify=settings.server.verify_ca)
+
+
+def user_nailgun_config(username=None, password=None):
+    """Return a NailGun configuration file constructed from default values.
 
+    :param user: The ```nailgun.entities.User``` object of an user with additional passwd
+        property/attribute
+
+    :return: ``nailgun.config.ServerConfig`` object, populated from user parameter object else
+        with values from ``robottelo.config.settings``
     """
     creds = (username, password)
     return ServerConfig(get_url(), creds, verify=settings.server.verify_ca)

tests/foreman/destructive/test_discoveredhost.py

@@ -13,10 +13,10 @@
 from copy import copy
 import re
 
-from nailgun import entity_mixins
 import pytest
 from wait_for import TimedOutError, wait_for
 
+from robottelo.config import default_nailgun_config
 from robottelo.logging import logger
 
 pytestmark = pytest.mark.destructive
@@ -124,7 +124,7 @@ def _assert_discovered_host(host, channel=None, user_config=None, sat=None):
         # raise assertion error
         raise AssertionError('Timed out waiting for "/facts" 201 response') from err
 
-    default_config = entity_mixins.DEFAULT_SERVER_CONFIG
+    default_config = default_nailgun_config()
 
     try:
         wait_for(