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.
Even if it doesn't support SSL (if not, gross), IMO this module should still have support for it.  Something like this came up the other day in another PR where the module was being modified to only check a specific URL rather than allowing the user to change the default.  IMO, for HTTP things, the user should be able to specifically check arbitrary paths as well as SSL/not in the event that the target in question is behind a proxy or something else that could manipulate the path and/or provide SSL.