[SeeRM:rapid7#1233] - Upgrade smb_enumshares to show directories & files

[SeeRM:rapid7#1233] - This is an upgrade based on ringt's code in PR rapid7#2017.
As a pentester, it's useful to obtain additional information such as
device type, access rights, folders, and files, etc when doing a share
enumeration.  I have also enhanced exception handling to avoid shutting
errors up, which is better for debugging purposes.

Author: wchen-r7