Add : check_ways objects.
Fix : remove useless print in checkways code.
Add PKGS for Redhat, Fedora & Debian

Issue: #762
Fix: Do not reset ticks on init only on __init__
Move initial_states logging from info to debug
Fix: WriteConcern will/must be handled using connection global parameters
Fix: WriteConcern will/must be handled using connection global parameters
Fix: WriteConcern and wrong initialization value
Dont log debug messages
Only log warning messages
Temporary revert for initial state logging
Fix: ticks handled only for pickled data - reset to 0 after success
Enh: issue #688 / basic prep
Enh: Issue #688 / basic prep part 2
Enh: Issue #688 / basic prep

part 3
Enh: Issue #688 / add configuration option
Remove useless import
Close connection after memcache operation.

It avoid long running TCP sessions and transient errors when memcache
is recycle.
Factorise memcache key normalisation and apply to hosts
Trap memcache exception