tests, schema: Replace deprecated uses of bootproto 'static' with 'none'

'none' has settled to signify static network configuration both in initscripts
(see sysconfig.txt or search for "Interface Configuration Files") and VDSM
(mostly in functional network tests).

Change-Id: I36de00f7da657061e6773f4263ce74e135282051
Signed-off-by: Ondřej Svoboda <osvoboda@redhat.com>
Reviewed-on: http://gerrit.ovirt.org/30244
Reviewed-by: Dan Kenigsberg <danken@redhat.com>