Only in a/: photon-hosts-template.patch
diff -rupr a/templates/hosts.photon.tmpl b/templates/hosts.photon.tmpl
--- a/templates/hosts.photon.tmpl	2016-12-22 15:15:38.409943103 -0800
+++ b/templates/hosts.photon.tmpl	2016-12-22 15:14:20.839459948 -0800
@@ -0,0 +1,23 @@
+## template:jinja
+{#
+This file /etc/cloud/templates/hosts.photon.tmpl is only utilized
+if enabled in cloud-config.  Specifically, in order to enable it
+you need to add the following to config:
+  manage_etc_hosts: True
+-#}
+# Your system has configured 'manage_etc_hosts' as True.
+# As a result, if you wish for changes to this file to persist
+# then you will need to either
+# a.) make changes to the master file in /etc/cloud/templates/hosts.photon.tmpl
+# b.) change or remove the value of 'manage_etc_hosts' in
+#     /etc/cloud/cloud.cfg or cloud-config from user-data
+# 
+# The following lines are desirable for IPv4 capable hosts
+127.0.0.1 {{fqdn}} {{hostname}}
+127.0.0.1 localhost.localdomain localhost
+127.0.0.1 localhost4.localdomain4 localhost4
+
+# The following lines are desirable for IPv6 capable hosts
+::1 {{fqdn}} {{hostname}}
+::1 localhost6.localdomain6 localhost6
+