qos basic scenario

Adding a basic test to check enforcement of QoS policy with
bandwidth limit rule QoS

Spec:
http://specs.openstack.org/openstack/neutron-specs/specs/liberty/qos-api-extension.html

Change-Id: Ifb319aefeee27b3e5f1bbe16ebb99bf73f4465e7
diff --git a/neutron/tests/tempest/scenario/constants.py b/neutron/tests/tempest/scenario/constants.py
index bb1cab3..258c587 100644
--- a/neutron/tests/tempest/scenario/constants.py
+++ b/neutron/tests/tempest/scenario/constants.py
@@ -14,3 +14,5 @@
 
 SERVER_STATUS_ACTIVE = 'ACTIVE'
 DEFAULT_SECURITY_GROUP = 'default'
+LIMIT_KILO_BITS_PER_SECOND = 1000
+SOCKET_CONNECT_TIMEOUT = 60