hash ring is in. But system is not tested yet
Message Server and Local Message Server are working now
testapp works with new hashring
Add exception handle in message server
1. check lastcmd in local message server; 2. separate lastcmdid and lastupdateringcmdid
Fix message server test because regarding lastCmdID changes
Exit mupd8 when ring is not inited.
add getter and setter for AppRuntime.ring