Get password_prompt_spoof module working. [RM #5940]
Updates pps description.
Incorporate the suggested edits from the PR review.
* Rewrites helpers to just use cmd_exec, since that works in meterpreter and shell.
* Changes _EOF_ to EOF, since that threw a harmless error in shell
commits
* Prefer using Post mixin API instead of rolling-own implementation
* Fixes whitespace
[SeeRM #5940]
MSF license, make use of print_good
Land #2220 - OSX Password Prompt Spoof