Currently add a new group perform the following steps:
1. move_servers_rsgroup will unassign all regions on hbase-rs-01 and hbase-rs-02
2. move_tables_rsgroup will also reassign all the regions of the table example.
This will lead to a large number of regions to migrate and affect the data locality.
However, some regions of the table that are distributed on hbase-rs-01 and hbase-rs-02, do not need to be moved.
So,we need a new shell command move_servers_tables_rsgroup which minimizes the number of regions needed to move.