The lower constraint file has been removed

This file, and its tests, are not useful for tripleo so we're
removing because they're now becoming problematic.

Signed-off-by: Kevin Carter <kecarter@redhat.com>
Change-Id: Ic4fd38526b345f9e366e750ece2864585916e462

lower-constraints.txt

@@ -1,33 +0,0 @@
-alabaster==0.7.10
-anyjson==0.3.3
-Babel==2.3.4
-coverage==4.0
-docutils==0.11
-extras==1.0.0
-fixtures==3.0.0
-flake8==2.5.5
-hacking==0.12.0
-imagesize==0.7.1
-Jinja2==2.10
-linecache2==1.0.0
-MarkupSafe==1.0
-mccabe==0.2.1
-pbr==2.0.0
-pep8==1.5.7
-pyflakes==0.8.1
-Pygments==2.2.0
-pystache==0.5.4
-python-mimeparse==1.6.0
-python-subunit==1.0.0
-pytz==2013.6
-PyYAML==3.12
-requests==2.14.2
-six==1.10.0
-snowballstemmer==1.2.1
-Sphinx==1.6.5
-sphinxcontrib-websupport==1.0.1
-stestr==2.0.0
-testscenarios==0.4
-testtools==2.2.0
-traceback2==1.4.0
-unittest2==1.1.0

tox.ini

@@ -36,8 +36,3 @@ commands = {posargs}
 exclude = .venv,.tox,dist,doc,*.egg
 show-source = true
 
-[testenv:lower-constraints]
-deps =
-  -c{toxinidir}/lower-constraints.txt
-  -r{toxinidir}/test-requirements.txt
-  -r{toxinidir}/requirements.txt