Be specific about the type of hash

See #2583. Since there are several types of hashes, we need to be more
specific about this -- see modules/exploits/windows/smb/psexec.rb which
uses an "smb_hash" as a password type.

Also, the fixes in #2583 do not appear to address anything else reported
on the Redmine issue, namely, operating system and architecture
identification discovered with this module (assuming good credentials).
Therefore, the Redmine issue should not be considered resolved.

[SeeRM #4398]
Update descriptions on SMB file utils.
Various title and description updates
Resplat and tabs
Merge pull request #2587 from todb-r7/release-fixup

Release fixups
Fix mimikatz error when password is nil

In some cases the password value that comes out of mimikatz results
is `nil`, instead of an empty string. This fixes this so that if
the string is `nil` is falls back to an empty string, resulting in
the call to `gsub` working instead of failing.
Land #2590, gsub nil fix for mimikatz