Remove ubuntu-10.04 from test-kitchen platforms

Per documentation:

Due to the state of flux in Erlang and the Erlang-SSL module, we have
been unable to get RabbitMQ and SSL working on Ubuntu platforms < 11.10
and Debian 6.x.
Merge pull request #202 from needle-cookbooks/remove-ubuntu-1004-suite

Remove ubuntu-10.04 from test-kitchen platforms