jvd-increase-rabbit-install-timeout Increase timeout for rabbitmq installation

In [this
job](https://travis-ci.org/travis-infrastructure/packer-build/jobs/380218767#L2730),
`apt_package[rabbitmq-server]` timed out after 900s. Doubling the wait
to see if that helps at all, or if something else is up.

Joep van Delft avatar Joep van Delft

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