Fix minor bugs and code refactoring

[ssuminahn]

:Release Notes: Fix minor bugs and code refactoring

:Detailed Notes:

• Convert function that generates date format file name to a library
• Modify repeated code into a common function
• Fix the part where the config created by the command is different from the git file
• Sort order of source require

:Testing Performed:

1. Pass unit test on ose
2. Check below commands and results 2-1. ares-config -p ose

   check git status and no diff files/config/config.json 2-2. Check each operation of ares-install/launch/device

:Issues Addressed: [WRN-1725] Fix minor bugs and code refactoring of CLI