add create table rpc
modified rpc interface,add service to hivemetastore
add create table like schema/ like table / create scheam and so on.
add 4 desc
add/drop/modify/show nodeGroup
merge zhuqihan
add showNodeAssignment
cmt agian
Merge remote-tracking branch 'origin/v0.2' into zhuqihan
modify SemanticAnalyzerFactory
merge with zjw
modify hive.g about nodeAssignment
Merge remote-tracking branch 'origin/zjw' into zhuqihan
remerge with zjw to solve hive.g mistake
Add split value implementation done, tested.
Merge remote-tracking branch 'origin/zjw' into v0.2, OK
Merge remote-tracking branch 'origin/zhuqihan' into v0.2, OK
Test user authentication and privilege authorization.
Merge zjw's branch for nodegroup/globalschema related implementations.
Merge remote-tracking branch 'origin/caoruyi' into macan, OK