Optimize nfs-related
update for integration-test
Merge pull request #209 from egisatoshi/develop

Add descriptions for some commands
Merge branch 'feature/divide-dependencies' into develop
Merge branch 'develop' of https://github.com/leo-project/leofs into develop
Fix the wrong explanation whereis
Add the desc for rebalance
Add the desc for recover-file
Add the desc for recover-node
Add the desc for recover-ring and recover-cluster
Revise description and usage
Update readme
Revise