[Trivial]Removed unused helper _extract_query_params
[Trivial]Removed unused helper _extract_query_params

Helper _extract_query_params is no longer used after
dbe6d502b7158673617a42f8638eaa1ae3c0e507, this is to remove it.

Change-Id: I2ba551760954c6c1ff1a01a9aa4557bbb0a54e6a

openstack/nova,mahak/nova,mahak/nova,rahulunair/nova,openstack/nova,klmitch/nova,rahulunair/nova,mahak/nova,klmitch/nova,rahulunair/nova,openstack/nova,klmitch/nova,klmitch/nova