Remove the dependency on horizon repo

* Due to this dependency mistral devstack pluging doesn't get
  installed properly because it can't constrain this dependency
  to a certain version

Change-Id: Ife4a2e3ace9d6325b27f995ceeafcd345dd8cc6d

test-requirements.txt

@@ -1,11 +1,11 @@
 # The order of packages is significant, because pip processes them in the order
 # of appearance. Changing the order has an impact on the overall integration
 # process, which may cause wedges in the gate later.
+
 # Hacking already pins down pep8, pyflakes and flake8
 hacking<0.11,>=0.10.0
-# Testing Requirements
-http://tarballs.openstack.org/horizon/horizon-master.tar.gz#egg=horizon
 
+# Testing Requirements
 coverage>=4.0 # Apache-2.0
 django-nose>=1.4.4 # BSD
 mock>=2.0 # BSD
@@ -18,8 +18,13 @@ openstack.nose-plugin>=0.7 # Apache-2.0
 nosehtmloutput>=0.0.3 # Apache-2.0
 selenium>=2.50.1 # Apache-2.0
 xvfbwrapper>=0.1.3 #license: MIT
+
 # Docs Requirements
 sphinx!=1.3b1,<1.4,>=1.2.1 # BSD
 oslosphinx>=4.7.0 # Apache-2.0
 reno>=1.8.0 # Apache-2.0
 docutils!=0.13.1,>=0.11 # OSI-Approved Open Source, Public Domain
+
+# Horizon requirements
+django-compressor>=2.0 # MIT
+django-openstack-auth>=2.4.0 # Apache-2.0

tox.ini

@@ -10,6 +10,7 @@ setenv =
    VIRTUAL_ENV={envdir}
 deps = -r{toxinidir}/requirements.txt
        -r{toxinidir}/test-requirements.txt
+       http://tarballs.openstack.org/horizon/horizon-master.tar.gz
 commands = 
     find . -type f -name "*.pyc" -delete
     /bin/bash run_tests.sh -N --no-pep8 {posargs}
@@ -50,7 +51,7 @@ commands = oslo_debug_helper {posargs}
 
 [flake8]
 show-source = True
-exclude=.venv,.git,.tox,dist,doc,*lib/python*,*egg,build,.ropeproject,tools
+exclude=.venv,.git,.tox,dist,doc,*lib/python*,*egg,build,.ropeproject,tools,horizon
 
 [testenv:releasenotes]
 commands = sphinx-build -a -E -W -d releasenotes/build/doctrees -b html releasenotes/source releasenotes/build/html