some config problems about secure hbase deployment

[Pan,Jinyu]

Hi，


When I followed the http://hbase.apache.org/book/security.html to deploy a 
secure hbase cluster,  I met some problems about config


1.       Only set “hbase.rpc.engine” as 
org.apache.hadoop.hbase.ipc.SecureRpcEngine, then it will use sasl to auth

2.       “hbase.regionserver.kerberos.principal” must set on master and client, 
or initial HBaseSaslRpcClient will fail, says the server name is null

    The vesion I used is 0.94.1-security