Implement migrate_stage2: remains file collection and targetFileMap.
Merge remote-tracking branch 'origin/zjw' into macan, bug fix for table/schema.
Add missing implement in HiveMetaStoreClient; fix nullpointer bug in session keeping; fix password handling.
test userassignment,roleassignment
Merge remote-tracking branch 'origin/zjw' into zhuqihan
Implement all migration code excludes client-side, not tested yet.
Merge remote-tracking branch 'origin/zjw' into macan, bug fix for fileSplitKey handling.
rpc node,nodegroup,role,user operate five
Merge remote-tracking branch 'origin/v0.2' into caoruyi
Change miss typed migrate_in in HiveMetaStoreClient.
modify hivemetastoreclient
Merge remote-tracking branch 'origin/v0.2' into caoruyi
alterSchemaStatementSuffix
modify AlterSchemaDesc.java
Merge remote-tracking branch 'origin/zjw' into zhuqihan
modify hivemetastoreclient
Merge remote-tracking branch 'origin/zhuqihan' into caoruyi
modify userassignment and roleassignment
Fix listTableFiles() to retrieve files in specified range.
Merge remote-tracking branch 'origin/zhuqihan' into v0.2, OK