chore(controller): remove check script

In older versions of confd, if a key did not exist then confd would
write out "<no value>" to the template. In confd 0.8 it will just
error out of the key is not found, so this check is no longer necessary.

Author: Matthew Fisher

controller/bin/check

@@ -11,5 +11,4 @@ keys = [
   "/deis/domains",
   "/deis/platform",
 ]
-check_cmd = "/app/bin/check {{ .src }}"
 reload_cmd = "/app/bin/reload"