Catch more errors when pushing a Docker image (ucbrise#663)

* Add new ReadTimeoutError to the 'retry' decorator(_push_model)

* Add more errors

clipper_admin/clipper_admin/clipper_admin.py

@@ -4,7 +4,8 @@
 from docker import errors
 import tempfile
 import requests
-from requests.exceptions import RequestException
+from urllib3.exceptions import TimeoutError
+from requests.exceptions import (RequestException, Timeout)
 import json
 import pprint
 import time
@@ -524,7 +525,8 @@ def build_model(self,
 
         self.logger.info("Pushing model Docker image to {}".format(image))
 
-        @retry(docker.errors.APIError, tries=5, logger=self.logger)
+        @retry((docker.errors.APIError, TimeoutError, Timeout),
+               tries=5, logger=self.logger)
         def _push_model():
             for line in docker_client.images.push(repository=image, stream=True):
                 self.logger.debug(line)