Hotfix the issue with too new Firefox version

which Selenium WebDriver cannot connect to.

Partial-Bug: 1590939
Change-Id: Ide1de4638b9c8b3e0ec1d34f7c044e8a96cc5890

tools/gate/integration/post_test_hook.sh

@@ -7,6 +7,11 @@ set -x
 # install avconv to capture video of failed tests
 sudo apt-get install -y libav-tools && export AVCONV_INSTALLED=1
 
+sudo wget -q -O firefox.deb https://sourceforge.net/projects/ubuntuzilla/files/mozilla/apt/pool/main/f/firefox-mozilla-build/firefox-mozilla-build_46.0.1-0ubuntu1_amd64.deb/download
+sudo apt-get -y purge firefox
+sudo dpkg -i firefox.deb
+sudo rm firefox.deb
+
 cd /opt/stack/new/horizon
 sudo -H -E -u stack tox -e py27integration
 retval=$?