Fixes installation of test-requirements

pip install fails because the "-f http...pysendfile.2.0.0.tar.gz"
returns 404. pip will install pysendfile 2.0.0 without defining
the url.

Ref: http://code.google.com/p/pysendfile/issues/detail?id=20&can=1

Closes bug 1314968

Change-Id: I15baf378b37841f8abb21294efebe2dee95077c3
(cherry picked from commit ed816a214be8acc17d75f68e6c2552fd3b1ad56f)