ezbake: Introduce service-port variable

This enables ezbake to use the port in templates,
e.g. rendering the systemd unit file. This is
required to add a post start command to check if
the tcp port is already reachable.

Author: bastelfreak

project.clj

@@ -88,6 +88,7 @@
 
   :uberjar-name "puppet-server-release.jar"
   :lein-ezbake {:vars {:user "puppet"
+                       :service-port 8140
                        :group "puppet"
                        :numeric-uid-gid 52
                        :build-type "foss"