Update dependencies on openSUSE

openSUSE 12.3 comes with the DHCP lease utilities in the dnsmasq-utils
package.

Also drop the gcc dependency in n-api (like it was done for debian, see
e9e80f9)

Change-Id: Id045674946d7856f6364c2357f3e126b05651461
diff --git a/files/rpms-suse/nova b/files/rpms-suse/nova
index 04af7f3..8a28e7d 100644
--- a/files/rpms-suse/nova
+++ b/files/rpms-suse/nova
@@ -1,6 +1,6 @@
 curl
-# Note: we need to package dhcp_release in dnsmasq!
 dnsmasq
+dnsmasq-utils # dist:opensuse-12.3
 ebtables
 gawk
 genisoimage # required for config_drive