[Common]: print a better error msg in opening a config file.
[Common]: print a better error msg in opening a config file.

icoming/FlashGraph,zheng-da/FlashX,flashxio/FlashX,flashxio/FlashX,icoming/FlashGraph,icoming/FlashGraph,flashxio/FlashX,flashxio/FlashX,zheng-da/FlashX,icoming/FlashGraph,zheng-da/FlashX,icoming/FlashX,icoming/FlashGraph,icoming/FlashX,flashxio/FlashX,zheng-da/FlashX,icoming/FlashX,flashxio/FlashX,icoming/FlashX,zheng-da/FlashX,icoming/FlashX