[Review Queue] elasticsearch ec2 fix (trusty)

[Michael Nelson]

After reviews by Simon and tests by Tim [1] I've just pushed an update
to the trusty elasticsearch charm which:

 * Fixes the firewall configuration so that nodes in the cluster can
find each other on ec2 (on ec2 the private-address is a private dns,
rather than a private IP expected by ufw) [2]
 * Enables the firewall to be switched off for easy testing of the
admin port [3]

-Michael

[1] http://reports.vapour.ws/charm-tests/charm-bundle-test-5034-results
[2] https://bugs.launchpad.net/charms/+source/elasticsearch/+bug/1386664
[3] https://bugs.launchpad.net/charms/+source/elasticsearch/+bug/1376396