contrail-test should have requirements.txt

[Harish Kumar]

requirements.txt can be used to install python requirements by install scripts or other code like docker build or package building scripts.

[OpenContrail Admin (ci-admin-f)]

Review in progress for https://review.opencontrail.org/16016
Submitter: Harish Kumar (<email address hidden>)

[OpenContrail Admin (ci-admin-f)]

Reviewed: https://review.opencontrail.org/16016
Committed: http://github.org/Juniper/contrail-test/commit/05d6897930ca626178884ab1544e51908e828d14
Submitter: Zuul
Branch: master

commit 05d6897930ca626178884ab1544e51908e828d14
Author: hkumarmk <email address hidden>
Date: Thu Dec 24 11:25:31 2015 +0530

Added requirements.txt

Added requirements.txt to add all python requirements, so this can be
used by installation scripts and other code like docker build, package
build scripts.

NOTE: The dependency package "discover" is required only for centos as
per setup_test_env from contrail-fabric-utils, but this kind of
conditional dependency resolution is not possible using
requirements.txt. Also we did a brief check on test discovery after
installing discover on ubuntu which is working, so adding that package
to requirements.txt.

Change-Id: I32aafa84cf8fc04ec5487c56c481ecfb43510cd4
Fixes-Bug: #1529571