IMPROVEMENTS:
Modify db_connection prefix default value to "instance_id + 'tf'"(#90)
Modify db_connection ID to make it more simple while importing it(#90)
Add wait method to avoid useless status error while creating/modifying account or privilege or connection or database(#90)
Support to set instnace name for RDS (#88)
Avoid container cluster cidr block conflicts with vswitch's (#88)
Output resource import information (#87)
BUG FIXES:
fix instance id not found and instane status not supported bug(#90)
fix deleting slb_attachment resource failed bug (#86)