clean up ubuntu versions

oneiric is long dead, remove references to it whenever possible
(one more subtle issue in cinder should be a seperate patch). This
includes removing the oneiric only tool build_uec.sh.

also remove the bulk of references to quantal, which is 8 months
out of support. note: raring only has support for the rest of the
month.

Change-Id: Ib17502be7572af76dc95560615221b48b970a547
diff --git a/files/apts/n-cpu b/files/apts/n-cpu
index 88e0144..29e3760 100644
--- a/files/apts/n-cpu
+++ b/files/apts/n-cpu
@@ -2,7 +2,7 @@
 nbd-client
 lvm2
 open-iscsi
-open-iscsi-utils # Deprecated since quantal dist:lucid,oneiric,precise
+open-iscsi-utils # Deprecated since quantal dist:precise
 genisoimage
 sysfsutils
 sg3-utils