Merge "Add detach to docker-toool"

diff --cc docker/docker-toool
index 0b87ea9,3132f8e..a1ffe34
--- 1/docker/docker-toool
--- 2/docker/docker-toool
+++ b/docker/docker-toool
@@@ -73,11 -77,9 +77,12 @@@ def parse_opts(argv)
  
      return opts
  
+ 
  def docker_arg_map(key, value):
      value = str(value).encode('ascii', 'ignore')
 +    if len(value) == 0:
 +        return ''
 +
      return {
          'environment': "--env=%s" % value,
          # 'image': value,