Adding Jenkins-CI Login Scanner

Per Github issue #3871 (RM8774), I have added a
login scanner module for Jenkins-CI installations.
Fixing Author Declaration

I had accidentally listed myself three times as the author.
Fixing that issue so that I am only declaring myself once.
Converting Module to LoginScanner w/ Specs

The previous commits for this Jenkins CI module relied on an
obsolete pattern.  Consequently, it was necessary to write
this module as a LoginScanner and incorporate the appropriate
specs so that the tests will run properly.
Removing 'require pry'

I accidentally left a reference to pry in my code.
Removing
Fixing Comment

Comment was incorrect and needed to be fixed.
Fine Tuning Jenkins Login Module

At the request of the maintainers, I have deregistered the
RHOST option and made the failure proof a verbose only
print.
Apply rubocop changes and remove multiline print
Land #3947, login scanner for jenkins by @nstarke