Applied tier0 and tier1 marks on unit tests and xmlrpc tests

Web UI tests were marked as tier1 tests.

The tier system is intended to be used together with CI system
to make sure the more complicated tests are being run only
when all of the basic functionality is working.

The system is using pytest's marker system. E.g. an invocation of
all tier1 tests with listing will look like:

    $ py.test -v -m tier1 ipatests

or in case of out of tree tests:

    $ ipa-run-tests -m tier1

Reviewed-By: Ales 'alich' Marecek <amarecek@redhat.com>

ipatests/test_xmlrpc/test_hbactest_plugin.py

@@ -25,12 +25,16 @@ from ipatests.test_xmlrpc.xmlrpc_test import XMLRPC_test, assert_attr_equal
 from ipalib import api
 from ipalib import errors
 from nose.tools import raises
+import pytest
 
 # Test strategy:
 # 1. Create few allow rules: with user categories, with explicit users, with user groups, with groups, with services
 # 2. Create users for test
 # 3. Run detailed and non-detailed tests for explicitly specified rules, check expected result
 #
+
+
+@pytest.mark.tier1
 class test_hbactest(XMLRPC_test):
     """
     Test the `hbactest` plugin.