packaging: setup: Default to empty gateway if no default
packaging: setup: Default to empty gateway if no default

If host has no default gateway, show '[]' instead of '[@DEFAULT@]'

Change-Id: I220addd09e0851581b10d516e04fcccbc17d1032
Signed-off-by: Yedidyah Bar David <e7f2f616ce8817ad893bbeaad3e942e94c69d323@redhat.com>

oVirt/ovirt-hosted-engine-setup,oVirt/ovirt-hosted-engine-setup