Potential fix for RoutingFilteringIT failure

`nukeProxyCaches` coupled with new expireCaches behaviour was throwing off the request count (since it appears to be now doing a GET - possibly related to the invalidation token, but that's just a guess) so move any calls to `nukeProxyCaches` to before the count is reset to stop potential side-effects from any expiration calls.

CI build: http://bamboo.s/browse/NX-OSSF116-1 :white_check_mark: