Installation of the rabbitmqadmin script fails when SSL is enabled.

Installation of the rabbitmqadmin script fails when SSL is enabled. I fixed this by using rabbitmq::ssl_management_port when SSL is enabled. Also added the '-k' flag for curl so it won't fail when using self signed certificates.
this belongs on the same line as the `}`, according to the style guide
although i'd probably use a [selector](https://docs.puppetlabs.com/puppet/latest/reference/lang_conditional.html#selectors) here.