Merge branch 'release/1.2.0' into develop
Refactor codes in api
Fix that not retrieve prev-members
Fix that not match hash with others
Fix that incorrect results in case of detach-operation
Fix that incorrect results in case of detach-operation#2
Refactor codes in worker
Add long-run tests
Bump leo_redundant_manager to 1.2.1
Merge branch 'release/1.2.1'