Use util.validate_query_params in list_traits
Use util.validate_query_params in list_traits

This patch try to use util.validate_query_params in list_traits.

trivial fix

Change-Id: Ifeaf610200fe9dd825612b89cbf526b218af93a1

mahak/nova,mikalstill/nova,rahulunair/nova,klmitch/nova,phenoxim/nova,gooddata/openstack-nova,openstack/nova,gooddata/openstack-nova,mikalstill/nova,openstack/nova,phenoxim/nova,openstack/nova,mikalstill/nova,gooddata/openstack-nova,klmitch/nova,mahak/nova,mahak/nova,klmitch/nova,rahulunair/nova,klmitch/nova,gooddata/openstack-nova,rahulunair/nova