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Race around mnesia:create_schema, mnesia:create_table #1

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@squaremo

On my mac, RabbitMQ with rabbithub as a plugin often (nearly always, in fact) fails to start.
It aborts in rabbithub_app:setup_schema while calling mnesia:create_table, and gives {badtype, rabbithub_lease, disc_copies, rabbit@localhost} as the reason.

It's easy to elicit this from mnesia:
$ erl

1> mnesia:start().
ok
2> mnesia:create_table(foo, [{attributes, [bar, baz]}, {disc_copies, [node()]}]).
{aborted,{bad_type,foo,disc_copies,nonode@nohost}}

This doesn't happen if you've called mnesia:create_schema/1 before starting mnesia. But wait -- that's exactly what setup_schema does!

I suspect there's a race between RabbitMQ calling mnesia:create_schema/1 and mnesia:start/0, and rabbithub doing so then trying to create the table.

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