upgrade pip and new pip deps

dask_ec2/salt.py

@@ -162,6 +162,20 @@ def __install_python_pip():
  raise DaskEc2Exception("%s\nCouldn't install python-pip. Error is above (maybe try again)" %
  e.last_exception)
 
+ @retry(retries=3, wait=0)
+ def __upgrade_pip():
+ cmd = "pip install --upgrade pip packaging appdirs six"
+ ret = master.exec_command(cmd, sudo=True)
+ if ret["exit_code"] != 0:
+ raise Exception(ret["stderr"])
+
+ try:
+ __upgrade_pip()
+ except RetriesExceededException as e:
+ raise DaskEc2Exception(
+ "%s\nCouldn't upgrade pip. Error is above (maybe try again)" %
+ e.last_exception)
+
  @retry(retries=3, wait=0)
  def __install_salt_rest_api():
  cmd = "pip install cherrypy"