Merge pull request #239 from solarchad/support-rm-container-prestart-…

…upstart-fix

fix: avoid setting multiple pre-start stanzas in upstart

docker/files/upstart.conf

@@ -13,15 +13,15 @@ respawn
 {%- set pull_before_start = container.get("pull_before_start") or False %}
 {%- set remove_before_start = container.get("remove_before_start") or False %}
 
-{%- if pull_before_start %}
+{%- if pull_before_start or remove_before_start -%}
 pre-start script
+{%- if pull_before_start %}
   /usr/bin/docker pull {{ container.image }}
-end script
 {%- endif %}
 
 {%- if remove_before_start %}
-pre-start script
   /usr/bin/docker rm -f {{ name }}
+{%- endif %}
 end script
 {%- endif %}