manifestcache: stop altering the lru cache order while displaying it
Accessing value with `.get` alter the iteration order and make the output of
the debug command misbehave, showing multiple entry twice.
We need more than 2 entry to see the bug, so there are not test change. Later
test will introduce a third entry and would fail without this fix.
from __future__ import absolute_import
import pkgutil
__path__ = pkgutil.extend_path(__path__, __name__)