Fix ssh alive interval time via overrides.yml

Change-Id: I555db9db7b39d6643d8d62de22db29fa06134b28
diff --git "a/\173\173 cookiecutter._env_name \175\175/overrides.yml" "b/\173\173 cookiecutter._env_name \175\175/overrides.yml"
index 21abf4b..fd85b72 100644
--- "a/\173\173 cookiecutter._env_name \175\175/overrides.yml"
+++ "b/\173\173 cookiecutter._env_name \175\175/overrides.yml"
@@ -22,6 +22,9 @@
   openssh:
     server:
       password_auth: true
+      alive:
+        interval: 18000
+        count: 0
   linux:
     system:
       user: