Install qemu-utils with nova-compute.

The split out of nova-kvm and nova-baremetal was buggy: qemu-utils is
needed to deploy baremetal images, so we should install it for every
nova-compute install. Similarly syslinux contains pxelinux.0 for
nova-baremetal as well as whatever nova-kvm uses from it.

Change-Id: I24eba7ecc3ca4eb9987b18693342d7a5ac2c8dee
Move more baremetal items out of nova-compute.

Baremetal DNSMasq and the baremetal deploy helper are not relevant to
nova-kvm.  Having them installed in nova-compute is confusing at best.
Also a failure to install syslinux would lead to no pxelinux.0 in the
tftpd root due to the copy code path failing open.

Change-Id: Ib51383c495fbe00626e45328cea7b7dd5d7bb0d0
Migrate routes onto $EXTERNAL_BRIDGE.

Since we migrate IP addresses from $PHYSICAL_INTERFACE to
$EXTERNAL_BRIDGE this breaks routes - we need to migrate them as well.

Change-Id: I618fbe76d189cd5a79e12a5264a3fc9779b2483c