Revert "Bind EPMD to api interface address"

This issue still exsits when disable ipv6 feature.

This reverts commit 5480bd9b.

Change-Id: I1e6c6bff5585cf5a49890668203d6971112c32f1

ansible/roles/rabbitmq/templates/rabbitmq-env.conf.j2

@@ -6,5 +6,14 @@ RABBITMQ_SERVER_ADDITIONAL_ERL_ARGS="-pa /usr/lib/rabbitmq/lib/{{ rabbitmq_versi
 
 RABBITMQ_LOG_BASE=/var/log/kolla/rabbitmq
 
-export ERL_EPMD_ADDRESS={{ api_interface_address }}
+# TODO(sdake, vhosakot)
+# erlang by default binds to wildcard (all interfaces) and can potentially
+# interfere with the neutron external or tenant networks. We should in theory
+# bind epmd to the host's IPv4 address to address the issue however this also
+# has issues and can crash erlang when it is compiled with IPv6 support.
+# See bugs:
+# https://bugs.launchpad.net/ubuntu/+source/erlang/+bug/1374109
+# https://bugs.launchpad.net/kolla/+bug/1562701
+# https://bugzilla.redhat.com/show_bug.cgi?id=1324922
+#export ERL_EPMD_ADDRESS={{ api_interface_address }}
 export ERL_EPMD_PORT={{ rabbitmq_epmd_port }}