Changes trove_client.client.HTTPClient to

trove_client.HTTPClient

Reasons:
 - trove shell is not working.
 - troveclient.client is now imported as trove_client
   but while calling the method it has been called
   as trove_client.client

Changes:
- Changes trove_client.client.HTTPClient to
  trove_client.HTTPClient in troveclient/v1/client.py

Change-Id: I12b0a0d9792f69ad04a17c36a8de134f233afc85
Closes-Bug: #1259882

troveclient/v1/client.py

@@ -82,7 +82,7 @@ class Client(object):
                     setattr(self, extension.name,
                             extension.manager_class(self))
 
-        self.client = trove_client.client.HTTPClient(
+        self.client = trove_client.HTTPClient(
             username,
             password,
             project_id,