Remove unused package in requirement.txt

[Noboru Arai]

This patch is similar to https://bugs.launchpad.net/glance/+bug/1252344.

Currently wsgiref/passlib package exist in requirement.txt,
but I confirmed that they are unused in glance source by "grep" command.

I removed them to clean up.

<example of "grep" command>
     -grep -r wsgiref
     -grep -r passlib

      ->"wsgiref" is a substring of the package name.

reference)
 wsgiref
  -http://docs.python.org/3.3/library/wsgiref.html
  -http://docs.python.org/2/library/wsgiref.html
  -https://pypi.python.org/pypi/wsgiref

 passlib
  -http://pythonhosted.org/passlib/

[OpenStack Infra (hudson-openstack)]

Reviewed: https://review.openstack.org/58909
Committed: http://github.com/openstack/glance/commit/b31874284212d49560ddf4f36e5c9ca5d221f605
Submitter: Jenkins
Branch: master

commit b31874284212d49560ddf4f36e5c9ca5d221f605
Author: Noboru Arai <email address hidden>
Date: Thu Nov 28 11:32:36 2013 +0900

    Remove unused package in requirement.txt

    This patch is similar to https://bugs.launchpad.net/glance/+bug/1252344.

    Currently wsgiref/passlib package exist in requirement.txt,
    but I confirmed that they are unused in glance source by "grep" command.

    I removed them to clean up.

    Closes-bug: #1255826
    Change-Id: Ibbc2f1d413efacd0c18ba16c9250ef08470667d1