fix pecan _lookup usage
fix pecan _lookup usage

_lookup routing in pecan is expected to be an object method. we
incorrectly set it to static which throws a few warnings. this patch
fixes it.

Closes-Bug: #1521283
Change-Id: I0911cbe830eef84af613e08dc9495109d27a1646

leandroreox/gnocchi,sileht/gnocchi,gnocchixyz/gnocchi,sileht/gnocchi,gnocchixyz/gnocchi,leandroreox/gnocchi