The website search is perpetually broken, has had XSS issues in the
past, and I suspect when it's working it's not as fast or capable as
a simple google site:libvirt.org search

Replace the <form> implementation with one that sends the user to
google.com with 'site:libvirt.org' appended to the search string
Reviewed-by: NDaniel P. Berrange <berrange@redhat.com>
Signed-off-by: NCole Robinson <crobinso@redhat.com>