rm some unused vars reports by pylint
Fix for issue #3718 memcache returner
depency python-memcached
(tested with archlinux python2-memcached)
https://bugs.launchpad.net/python-memcached
simplify dict loops

use .values() instead of .items() when not using the keys
use .keys() directly instead of rebuilding lists from it
Update memcache_return.py

removed logging, this didn't work on daemonized salt
only on salt-call --local
Merge pull request #4757 from aboe76/return_memcache

Fix for issue #3718 memcache returner
Merge pull request #4756 from hulu/rm-some-unused-vars

rm some unused vars reported by pylint
Merge pull request #4758 from hulu/simplify-dict-loops

simplify dict loops