Fix the build worker to use the latest docker-py.

workers/dockerfilebuild.py

@@ -49,6 +49,11 @@ class StatusWrapper(object):
     build_logs.set_status(self._uuid, self._status)
 
 
+def unwrap_stream(json_stream):
+  for json_entry in json_stream:
+    yield json.loads(json_entry).values()[0]
+
+
 class DockerfileBuildContext(object):
   def __init__(self, build_context_dir, dockerfile_subdir, repo, tag_names,
                push_token, build_uuid):
@@ -57,7 +62,7 @@ class DockerfileBuildContext(object):
     self._repo = repo
     self._tag_names = tag_names
     self._push_token = push_token
-    self._cl = Client(timeout=1200, version='1.7')
+    self._cl = Client(timeout=1200)
     self._status = StatusWrapper(build_uuid)
     self._build_logger = partial(build_logs.append_log_message, build_uuid)
 
@@ -109,7 +114,7 @@ class DockerfileBuildContext(object):
 
     current_step = 0
     built_image = None
-    for status in build_status:
+    for status in unwrap_stream(build_status):
       status_str = str(status.encode('utf-8'))
       logger.debug('Status: %s', status_str)
       step_increment = re.search(r'Step ([0-9]+) :', status)