Merge branch 'release/1.8.4' into develop
Fix not sync ring with manager-node
Modify membership interval
Implement retrieving consistency level
Add warning-log at get_redundancies-fun
Refactor worker's test-case
Remove an unnecessary row
Remove unnecessary rows
Update required version for travis
Bump leo_redundant_manager to 1.8.5
Merge branch 'release/1.8.5'