[Bug 1374109] [NEW] epmd does not support binding to an IPv4 address anymore

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The bug is actually located in erlang itself. epmd fails to bind to any
IPv4 address if instructed to do so

[Impact]
Users of RabbitMQ in IPv4 environments are unable to start rabbitmq unless the environment variable ERL_EPMD_ADDRESS is unset. In case of disabled IPv6 support there is no valid setting for ERL_EPMD_ADDRESS as
* IPv4 addresses will be rejected as syntacitcally invalid
* IPv6 addresses will fail to bind

[Test Case]
service rabbitmq-server stop && killall epmd

ERL_EPMD_ADDRESS="127.0.0.1" epmd
epmd: Thu Sep 25 21:00:16 2014: cannot parse IP address "127.0.0.1"

same could be acieved with the epmd's -address option

In case IPv6 support is disabled:
ERL_EPMD_ADDRESS="::1" epmd
epmd: Thu Sep 25 21:01:40 2014: failed to bind socket: Cannot assign requested address

-- rabbitmq case:
cat rabbitmq-env.conf
export RABBITMQ_NODENAME=rabbit at localhost
export RABBITMQ_NODE_IP_ADDRESS=127.0.0.1
export ERL_EPMD_ADDRESS=127.0.0.1

service rabbitmq-server start
 * Starting message broker rabbitmq-server
 * FAILED - check /var/log/rabbitmq/startup_\{log, _err\}                                                        [fail]

Commenting/removing the "export ERL_EPMD_ADDRESS=127.0.0.1" line
resolves the issue

[Possible cause]
In this bug: https://bugs.launchpad.net/ubuntu/+source/rabbitmq-server/+bug/1312507?comments=all

The issue was fixed using -DEPMD6" in CPPFLAGS
(https://bugs.launchpad.net/ubuntu/+source/rabbitmq-
server/+bug/1312507/comments/5) which perhaps (I speculate only)
activates some of the erlang's IPV6_V6ONLY definitions.

There is another complaint regarding the same issue here:
https://bugs.launchpad.net/ubuntu/+source/rabbitmq-
server/+bug/1312507/comments/14

[System info]
lsb_release -rd
Description:	Ubuntu 14.04.1 LTS
Release:	14.04

apt-cache policy rabbitmq-server
rabbitmq-server:
  Installed: 3.2.4-1
  Candidate: 3.2.4-1


apt-cache policy erlang-base
erlang-base:
  Installed: 1:16.b.3-dfsg-1ubuntu2.1
  Candidate: 1:16.b.3-dfsg-1ubuntu2.1

** Affects: erlang (Ubuntu)
     Importance: Undecided
         Status: New

-- 
epmd does not support binding to an IPv4 address anymore
https://bugs.launchpad.net/bugs/1374109
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