Fix heat-cfntools to work on Fedora

Also add redhat-lsb to Fedora images for lsb_release which should prove
useful as a way to do distro-specific things.

Change-Id: Ie32566349319ca244fa02065bb9f81c36c1b49fb

elements/fedora/install.d/00-lsb

@@ -0,0 +1,3 @@
+#!/bin/bash
+
+exec install-packages redhat-lsb

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

@@ -4,6 +4,12 @@
 
 set -uex
 
+# This is a specific workaround for Ubuntu
+distro=$(lsb_release -is || :)
+if [ "$distro" != "Ubuntu" ] ; then
+    exit 0
+fi
+
 # Setup ec2-user as expected by HEAT
 if ! getent passwd ec2-user ; then
     useradd -m -G admin ec2-user -s /bin/bash
@@ -23,4 +29,5 @@ Pin: release o=LP-PPA-tripleo-demo
 Pin-Priority: 900
 EOF
 # Should pull from demo PPA if cloud-init exists there.
-install-packages cloud-init
+# Since this is Ubuntu only, the --force-yes is OK
+install-packages --force-yes cloud-init