Fix issue with secure pip download

It is require for new version of pip 1.5:
  pip no longer will scrape insecure external urls by default
  nor will it install externally hosted files by default.
  Users may opt into installing externally hosted or
  insecure files or urls using --allow-external PROJECT and
  --allow-unverified PROJECT. (Pull #1055)

  link with more detailed information:
  http://www.pip-installer.org/en/latest/news.html

Change-Id: Id5255c17b4240ad4025f16b9ebcacb9f55568c04
Closes-Bug: #1267420