Move API tests to neutron.test.api

To make api test development simpler, move the tests to
neutron.tests.api.  The neutron.tests.tempest subtree will remain
while work continues to transition the required functionality to
tempest-lib.

Change-Id: Ie90671fbfe2f633e851da82728e152482133fd87
diff --git a/neutron/tests/tempest/test.py b/neutron/tests/tempest/test.py
index 2f35710..4bb1960 100644
--- a/neutron/tests/tempest/test.py
+++ b/neutron/tests/tempest/test.py
@@ -30,7 +30,7 @@
 import testscenarios
 import testtools
 
-from neutron.tests.api.contrib import clients
+from neutron.tests.api import clients
 from neutron.tests.tempest.common import credentials
 import neutron.tests.tempest.common.generator.valid_generator as valid
 from neutron.tests.tempest import config