Extend getUser to get user groups

Related: https://pagure.io/koji/issue/3854

tests/test_cli/test_userinfo.py

@@ -20,6 +20,7 @@ class TestUserinfo(utils.CliTestCase):
                           'krb_principals': ['test-principal'],
                           'name': self.user,
                           'status': 0,
+                          'groups': ['group1', 'group2'],
                           'usertype': 0}
         self.user_perms = ['admin', 'tag']
         self.count_list_packages = 2
@@ -65,6 +66,9 @@ krb principals:
 Permissions:
   admin
   tag
+Groups:
+  group1
+  group2
 Status: NORMAL
 Usertype: NORMAL
 Number of packages: 2

tests/test_hub/test_get_user.py

@@ -93,8 +93,7 @@ class TestGetUser(DBQueryTestCase):
         columns = ['id', 'name', 'status', 'usertype']
         self.assertEqual(set(query.columns), set(columns))
         self.assertEqual(query.clauses, ['users.id = %(id)i'])
-        self.assertEqual(query.joins, ['LEFT JOIN user_krb_principals ON '
-                                       'users.id = user_krb_principals.user_id'])
+        self.assertEqual(query.joins, [])
         self.assertEqual(query.values, userinfo)