delete some properties about schema
Merge remote-tracking branch 'origin/v0.2' into zhuqihan
modify dropSchema sucessfully
add testgrant log
Add new file creation policy for data loading system; Change MFile defination and related OR mappings.
Merge remote-tracking branch 'origin/zhuqihan' into v0.2, OK
Fix split_name miss typo in Hive.g
Merge from origin/zhaoyang's branch for msg notifier.
Merge remote-tracking branch 'origin/v0.2' into zhaoyang
Push MFile's objid on REP_FILE_CHANGE event; Push dbname and tablename on CREATE_FILE event.
Merge remote-tracking branch 'origin/zhaoyang' into v0.2, OK
modify msg add table,db info about a file
fix ObjectStore
Add load_status to MFile for load system; DM send rep/del request in standalone thread to increase performance; Allocate new file in table's node group; Optimize findbackupdevice; Create root user automatically; Unit test for file based migration; Implement reopen file; Fix alter_table msg handling.
Fix NumberFormatException for create_file_by_policy; fix NullPointer for filterTableFiles; fix version check bug inf create_file_by_policy.
add grant schema
Merge remote-tracking branch 'origin/v0.2' into zhuqihan
modify alter dbproperties change null to not null
modify alterFileSplit but not successfully
Bug fixing commit: reopen, checker thread, listDevice ...