Only route everything through the seed if...

the baremetal gateway is configured to be the baremetal seed IP.

By default devtest has always routed all traffic to the baremetal
network through the seed IP. This isn't required (and
can actually cause connectivity issues) if you are using
an alternate gateway on your baremetal network.

This should make using devtest_seed.sh on real networks
more configurable.

Change-Id: I15c870c1a8c7d3986b15ae0b919f50d0d2881e1f
Merge "Only route everything through the seed if..."