webui: Remove unneeded <br />
don't barf if logging out without credentials

This can happen if the admin server is reinstalled, but the
browser still has an active UCS session in the Rails session cookie.
make it more obvious why compute/storage buttons are missing
rename Update button to Apply
Simplify navigation in webui

We only show a Cisco UCS navigation item in the utils menu. If the user
is not logged in, then this will redirect to the settings page.  If the
user is logged in, they can access the settings page via a button on the
dashboard page.
Merge pull request #2 from aspiers/webui-fixes

Do not add a toplevel navigation item for UCS
Check that the login URL is a HTTP/HTTPS one

I tried entering random data and it crashed, so a check wouldn't hurt.
check that login URL has a valid hostname

otherwise things like http:///foo/nuova can cause an ugly error
Merge pull request #1 from aspiers/valid-url

check that login URL has a valid hostname
Merge pull request #3 from vuntz/valid-url

Check that the login URL is a HTTP/HTTPS one