Fix pylint tips

Fix pylint tips

Change-Id: Id323538fd9bb643bdf4d5f94e77f7578eb85f14e
C:  1,0: Missing docstring
E: 19,0: No name '__version__' in module 'mic'
E: 20,0: No name 'utils' in module 'mic'
E: 21,0: No name 'conf' in module 'mic'
E: 22,0: No name 'plugin' in module 'mic'
W:101,14:MicCmd.help_create: Access to a protected member _help_reindent of a client class
W:102,14:MicCmd.help_create: Access to a protected member _help_preprocess of a client class
R: 94,4:MicCmd.help_create: Method could be a function
C:108,4:MicCmd.do_create: Missing docstring
R:108,4:MicCmd.do_create: Method could be a function
C:112,4:MicCmd._root_confirm: Missing docstring
R:112,4:MicCmd._root_confirm: Method could be a function
R:120,4:MicCmd.do_convert: Too many local variables (16/15)
E:148,8:MicCmd.do_convert: Instance of 'ConfigMgr' has no 'convert' member
W:120,25:MicCmd.do_convert: Unused argument 'subcmd'
R:120,4:MicCmd.do_convert: Too many branches (16/12)
E:216,8:MicCmd.do_chroot: Instance of 'ConfigMgr' has no 'chroot' member
W:192,24:MicCmd.do_chroot: Unused argument 'subcmd'