Modify web.xml and application login method to "form" #559

Is your feature request related to a problem? Please describe.
As we are supporting multiple login methods "form" is the most appropriate way to handle the client-side redirects and further continuation on to the appropriate identity provider.

Describe the solution you'd like
Change web.xml and any other approrpriate files to redirect to a "form" (e.g. the login page) and setup behavior as appropriate

Describe alternatives you've considered
Every implementation completely implements the login page and sequence.

Additional context

• OpenDCS Postgres and Oracle implementations will be getting a local "username/password" identity provider.