Add SSL  parameters to negative tests

SSL parameters are not passed on to negative tests using the negative rest
client. This change updates the client from rest_client to service_client.

Change-Id: I2a2973f17dbe17acc196c0d264e6c25115c8174a
Closes-bug: #1413292
diff --git a/tempest/common/negative_rest_client.py b/tempest/common/negative_rest_client.py
index d9842e6..a02e494 100644
--- a/tempest/common/negative_rest_client.py
+++ b/tempest/common/negative_rest_client.py
@@ -15,18 +15,16 @@
 #    License for the specific language governing permissions and limitations
 #    under the License.
 
-from tempest_lib.common import rest_client
-
+from tempest.common import service_client
 from tempest import config
 
 CONF = config.CONF
 
 
-class NegativeRestClient(rest_client.RestClient):
+class NegativeRestClient(service_client.ServiceClient):
     """
     Version of RestClient that does not raise exceptions.
     """
-
     def __init__(self, auth_provider, service):
         region = self._get_region(service)
         super(NegativeRestClient, self).__init__(auth_provider,