Returns a int value for AUTHENTICATED or FAILED_AUTHENTICATION after
pulling the username and password from the request, authenticating
the user and setting it into the session.
Returns a int value for AUTHENTICATED or FAILED_AUTHENTICATION after
using the username and password to authenticate the user and setting
that user information into the session.
Returns a int value for AUTHENTICATED or FAILED_AUTHENTICATION after
using the username and password to authenticate the user and setting
that user information into the session.