Target ec2-user workaround to Ubuntu 12.10.

Ubuntu 13.04 has been confirmed to work properly, so only Ubuntu 12.10
is affected by the bug (http://pad.lv/1100920). Thus, we can narrow the
scope of the workaround to just "Ubuntu quantal".

Change-Id: Ib42e2bce2f4d0d2cfd6bdeb70cfa4162c2cd6433

elements/heat-cfntools/install.d/10-ec2-user

@@ -4,11 +4,15 @@
 
 set -uex
 
-# This is a specific workaround for Ubuntu
+# This is a specific workaround for Ubuntu 12.10 "quantal"
 distro=$(lsb_release -is || :)
 if [ "$distro" != "Ubuntu" ] ; then
     exit 0
 fi
+codename=$(lsb_release -cs || :)
+if [ "$codename" != "quantal" ] ; then
+    exit 0
+fi
 
 # Setup ec2-user as expected by HEAT
 if ! getent passwd ec2-user ; then
@@ -23,6 +27,10 @@ fi
 # We must pin to this fixed cloud-init from the demo ppa to ensure keys
 # are installed. This can be removed if http://pad.lv/1100920 is ever
 # fixed in the distro
+
+add-apt-repository -y ppa:tripleo/demo
+apt-get update
+
 cat > /etc/apt/preferences.d/cloud-init-from-ppa <<EOF
 Package: cloud-init
 Pin: release o=LP-PPA-tripleo-demo