Adding Login Scanner for MyBook Live

This is a LoginScanner auxiliary module for Western
Digital MyBook Live NAS devices as well as the spec
for testing.
Fixes to MyBook Live Module

This commit contains three fixes as requested on PR
#4003.  Those include:

+ Removing extraneous puts statement
+ Checking for valid response
+ SSL support.
More Fixes for WD MyBook Live Scanner

Fixes include removing deregistered options
from credentials collection object and adding proof
 when there is no response
Cleanup.  Sanity check in setup.  vprint
Properly encode body and catch invalid configs
Merge pull request #1 from jhart-r7/landing-4003-jhart

Cleanup.  Sanity check in setup.  vprint
Update description about pureftpd_bash_env_exec

Make exploitable requirements more obvious
100 columns per line
Use configured method and URI rather than duplicated values
Land #4003, @nstarke's Login Scanner for WD MyBook Live NAS
Normalize description
Land #4078, pureftpd_bash_env_exec desc. update