Use iputils-arping package for Ubuntu Oneiric distribution

Turns out the `arping' package, currently installed by the script,
is incompatible with `network-manager', the default network configuration
package for recent Ubuntu distributions.  (Losing network connectivity
on a reboot after running `stack.sh' is a little disconcerting.)
Forturnately, the `iputils-apring' package provides the same functionality
and is compatible with `network-manager' so install that one instead.

Change-Id: Id6e89cdf3e590481f870127697baa453b34fbc24
Signed-off-by: Don Dugger <donald.d.dugger@intel.com>
diff --git a/files/apts/nova b/files/apts/nova
index f4fe459..b034509 100644
--- a/files/apts/nova
+++ b/files/apts/nova
@@ -2,7 +2,8 @@
 dnsmasq-utils # for dhcp_release only available in dist:oneiric
 kpartx
 parted
-arping # used for send_arp_for_ha option in nova-network
+arping # only available in dist:natty
+iputils-arping # only available in dist:oneiric
 mysql-server # NOPRIME
 python-mysqldb
 python-xattr # needed for glance which is needed for nova --- this shouldn't be here