web: IPv4 input control

Added to STYLE.html

Reviewed-by: Stef Walter <stefw@redhat.com>
web: Actually close the panel-default div and fix indentation

Reviewed-by: Stef Walter <stefw@redhat.com>
web: Make sure IPv4 octet numbers are between 1 and 255

Reviewed-by: Stef Walter <stefw@redhat.com>