Move the test_utils module to scenario test dir

The test_utils module in tempest.common.utils is only useful for
scenario tests. So it's a little confusing to have it in the common
directory. This commit corrects this by moving the file into the
scenario directory. The service tag requirement for scenario tests
hacking check is updated to only check scenario test files, because
a method in the new utils module was being picked up incorrectly.

Change-Id: I1d70745a5ee07923e680328e5b8a29bfb82d8099
diff --git a/tempest/hacking/checks.py b/tempest/hacking/checks.py
index 234faad..270851d 100644
--- a/tempest/hacking/checks.py
+++ b/tempest/hacking/checks.py
@@ -47,7 +47,7 @@
     T104: Scenario tests require a services decorator
     """
 
-    if 'tempest/scenario' in filename:
+    if 'tempest/scenario/test_' in filename:
         if TEST_DEFINITION.match(physical_line):
             if not SCENARIO_DECORATOR.match(previous_logical):
                 return (physical_line.find('def'),
diff --git a/tempest/scenario/test_server_basic_ops.py b/tempest/scenario/test_server_basic_ops.py
index 285c030..aa39844 100644
--- a/tempest/scenario/test_server_basic_ops.py
+++ b/tempest/scenario/test_server_basic_ops.py
@@ -14,10 +14,10 @@
 #    under the License.
 
 from tempest.common.utils import data_utils
-from tempest.common.utils import test_utils
 from tempest import config
 from tempest.openstack.common import log as logging
 from tempest.scenario import manager
+from tempest.scenario import utils as test_utils
 from tempest import test
 
 import testscenarios
diff --git a/tempest/common/utils/test_utils.py b/tempest/scenario/utils.py
similarity index 98%
rename from tempest/common/utils/test_utils.py
rename to tempest/scenario/utils.py
index cc0d831..4702c72 100644
--- a/tempest/common/utils/test_utils.py
+++ b/tempest/scenario/utils.py
@@ -79,7 +79,7 @@
 
     class TestInputScenario(manager.OfficialClientTest):
 
-        scenario_utils = test_utils.InputScenarioUtils()
+        scenario_utils = utils.InputScenarioUtils()
         scenario_flavor = scenario_utils.scenario_flavors
         scenario_image = scenario_utils.scenario_images
         scenarios = testscenarios.multiply_scenarios(scenario_image,