updated memcache wrappers to support new config format
added support for splitting servers.ini into config/servers/*
Renamed "groups" to "clusters"
Fix foreach error on shutdown when no servers are defined
Fixed merging of roles to work with new cluster config file layout
Merge branch 'json-post-data' into refactor-configmanager-serversini
Use $cfg->activerole instead of $cfg->servers["role"]
Added support for application double-writes, and cleaned up db sharding
removed extraneous log entries for memcache
Renamed $cfg->activerole back to $cfg->role, added comments
Merge branch 'refactor-configmanager-serversini'