remove apt_mk_version

Change-Id: Iad8794ca476d987741e24f9aa63ea1b406854ca6
diff --git a/init.yml b/init.yml
index 121c2ce..0ed24ef 100644
--- a/init.yml
+++ b/init.yml
@@ -38,8 +38,6 @@
 - service.docker.host
 parameters:
   _param:
-#    apt_mk_version: 'proposed'
-    apt_mk_version: '2018.7.0-milestone1'
     aptly_gpg_keypair_id: A8272E04
     aptly_gpg_passphrase: ""
     aptly_server_secure: true