Fix typo in code

This change fixes typo from 'resouce_classes' to
'resource_classes' in delete api call.

Also adds missing dependency for webtest library.

Change-Id: If5135a67187deccec0834f2b2af5dc38f7c5a909
(cherry picked from commit 67d9c3cc28)
(cherry picked from commit df5a1bdac8)

cyborg/common/placement_client.py

@@ -318,7 +318,7 @@ class PlacementClient(object):
     def delete_rc_by_name(self, context, name):
         """Delete resource class from placement by name."""
         resp = self.delete(
-            "/resouce_classes/%s" % name, global_request_id=context.global_id)
+            "/resource_classes/%s" % name, global_request_id=context.global_id)
         if not resp:
             msg = ("Failed to delete resource class record with placement "
                    "API for resource class %(rc_name)s. Got "

test-requirements.txt

@@ -18,3 +18,4 @@ doc8>=0.6.0 # Apache-2.0
 Pygments>=2.2.0 # BSD license
 os-resource-classes>=0.5.0 # Apache-2.0
 cursive>=0.2.1 # Apache-2.0
+WebTest>=2.0.27 # MIT