Remove 'apt_mk_version' from overrides.yml

'apt_mk_version' is already exists in cookiecutter-templates
and can be overriden there.

Change-Id: I8f621d4d80a1042976481c2d4ae51228b0454b6b
diff --git "a/\173\173 cookiecutter._env_name \175\175/overrides.yml" "b/\173\173 cookiecutter._env_name \175\175/overrides.yml"
index 3c17bd2..2ea4934 100644
--- "a/\173\173 cookiecutter._env_name \175\175/overrides.yml"
+++ "b/\173\173 cookiecutter._env_name \175\175/overrides.yml"
@@ -13,7 +13,6 @@
   _param:
     salt_api_password_hash: $6$V7O4vDAF$1FYwutKk53WFY314nq5IshabL5YXMuYklGglD7/Toj9bzCcgHTgudxhdeexmE3jf21lZPLmXy9K5mwzGyFbQt1
     salt_api_password: hovno12345!
-    apt_mk_version: stable  # This will be replaced with REPOSITORY_SUITE env variable
     # Use galera options suitable for virtualized control plane
     galera_innodb_read_io_threads: 2
     galera_innodb_write_io_threads: 2