* support custom port in mirror_url

* refactor mirror_url validation to a shared example

* make mirror_url consistent in broker class and add shared example to test this

* make mirror_url consistent in consumer class and add shared example to test this

* make mirror_url consistent in producer class and add shared example to test this

* factor out repeated mirror_url regex to $kafka::params::mirror_url_regex

* support custom port in mirror_url

* refactor mirror_url validation to a shared example

* make mirror_url consistent in broker class and add shared example to test this

* make mirror_url consistent in consumer class and add shared example to test this

* make mirror_url consistent in producer class and add shared example to test this

* factor out repeated mirror_url regex to $kafka::params::mirror_url_regex

* ruuubooocooop! <waves fist>

* ruuubooocooop! <waves fist>