Clean up auth form handling

Clean up auth form handling

Instead of scanning the login form and only displaying specific prompts,
display and record responses for all <input type="text">, and
<input type="password"> elements in the login form. It is still limited to
a single <select> element. The support for combining a securid code and pin
has also been removed.

Signed-off-by: Chaskiel Grundman <cg2v@andrew.cmu.edu>
Signed-off-by: David Woodhouse <David.Woodhouse@intel.com>