refactor:delete unused methods
add safecopy mode
Merge branch 'master' of git@github.com:roma/roma into safe_copy
add test for safecopy
add command of strage status
add method for cachecleaning
add command process for safecopy
Add status log
Add check and open cache in opendb
Add storage backup command
add test code for the safecopy
Merge branch 'safe_copy' of https://github.com/jun930/roma into sc_copy