Allow poodle attack in `Rabbitmq` configuration in Ubuntu 12.04.

The Erlang that Ubuntu 12.04 installs does not apply the patch,
which solves the SSL poodle attack problem.
In order to workaround this issue in Ubuntu 12.04 environment,
add "ssl_allow_poodle_attack,  true" to the configuration file.
Add test for `ssl_allow_poodle_attack` in Ubuntu 12.04.