NSB: count from 0, vnf_0, tg_9, private->uplink, public->downlink

NSB: count from 0, vnf_0, tg_9, private->uplink, public->downlink

Also rename private to uplink, public to downlink

for scale-out template we need to count from 0
so we can use range() without +1/-1 errors

vnf_0, vnf_1
tg_0, tg_1

also fix Ixia defaults

Change-Id: I6aecfbb95f99af20f012a9df19c19be77d1b5b77
Signed-off-by: Ross Brattain <ross.b.brattain@intel.com>
Signed-off-by: Edward MacGillivray <edward.s.macgillivray@intel.com>