Hotfix: docker:host:enabled default value

Change-Id: Ie7f99c1e89e9169ca6ddf643d1ec0128ef959bcc
diff --git a/docker/host.sls b/docker/host.sls
index da8291e..f436349 100644
--- a/docker/host.sls
+++ b/docker/host.sls
@@ -1,6 +1,6 @@
 {% from "docker/map.jinja" import host with context %}
 
-{%- if host.enabled %}
+{%- if host.get('enabled', False) %}
 
 docker_packages:
   pkg.installed: