django-nose==1.4.4 dropped django 1.7 support

[Rodion Tikunov]

Confirmed on:
MOS 7.0

Issue:
CI tests gate-horizon-python27 for the horizon failed up with "/home/jenkins/workspace/gate-horizon-python27/manage.py: error: no such option: --exclude-dir" error.
It occurs because a new version of django-nose dropped Django 1.7 support. Details https://pypi.python.org/pypi/django-nose in changelog 1.4.4 (2016-06-27)

Details:
13:36:56 /home/jenkins/workspace/gate-horizon-python27/manage.py: error: no such option: --exclude-dir
13:36:56 Tests failed.
13:36:56 ERROR: InvocationError: '/bin/bash run_tests.sh -N --no-pep8'

http://logs.mosi.mirantis.net/91/25291/1/check/gate-horizon-python27/dec2033/console.html

[Rodion Tikunov (rtikunov)]

Fix: https://review.fuel-infra.org/#/c/25333/

[Rodion Tikunov (rtikunov)]

Fix merged: https://review.fuel-infra.org/#/c/25407/