update.py saves files with CRLF EOL style on Windows

[Alessandro Pilotti]

By executing on Windows:

python update.py ..\python-novaclient

As detailed in:

http://wiki.openstack.org/CommonLibrary

File are saved with CRLF EOL convention and need no be converted to UNIX EOL before commit.

[Mark McLoughlin (markmc)]

Here's the code responsible

  def _replace(path, pattern, replacement):
      with open(path, "r+") as f:
          lines = f.readlines()
          f.seek(0)
          f.truncate()
          for line in lines:
              f.write(re.sub(pattern, replacement, line))

[Mark McLoughlin (markmc)]

https://review.openstack.org/17296