Handle Updates a bit better

Handle Updates a bit better

- Have a separate dialog for updates (allowing us to refactor the current dialog into a separate file)
- Save all user supplied parameters (in case we need them later)
- Set up parameters from these as appropriate for the update case.
- Remove some old cruft from no-longer needed Dialogs

We still have some work to do because an update will sense shibd running and we are about to stop it.

git-svn-id: https://svn.shibboleth.net/cpp-sp/branches/REL_2@3685 cb58f699-b61c-0410-a6fe-9272a202ed29