Remove lower-constraints remnants

These were missed in change: I63153d3258e10d232f86f7a8b652eb7028aab4c6

Change-Id: I47388f13483d2938208ba385be4c94731e79e3ae

lower-constraints.txt

@@ -1,40 +0,0 @@
-alabaster==0.7.10
-appdirs==1.3.0
-Babel==2.3.4
-coverage==4.0
-docutils==0.11
-dulwich==0.15.0
-extras==1.0.0
-fixtures==3.0.0
-flake8==2.5.5
-hacking==0.12.0
-imagesize==0.7.1
-iso8601==0.1.11
-Jinja2==2.10
-keystoneauth1==3.4.0
-linecache2==1.0.0
-MarkupSafe==1.0
-mccabe==0.2.1
-netaddr==0.7.18
-oslo.config==5.2.0
-oslo.i18n==3.15.3
-pbr==2.0.0
-pep8==1.5.7
-pyflakes==0.8.1
-Pygments==2.2.0
-python-mimeparse==1.6.0
-python-subunit==1.0.0
-pytz==2013.6
-PyYAML==3.12
-requests==2.14.2
-requestsexceptions==1.2.0
-rfc3986==0.3.1
-six==1.10.0
-snowballstemmer==1.2.1
-stestr==2.0.0
-stevedore==1.20.0
-testrepository==0.0.18
-testtools==2.2.0
-traceback2==1.4.0
-unittest2==1.1.0
-wrapt==1.7.0

tox.ini

@@ -38,12 +38,6 @@ commands =
 deps = {[testenv:docs]deps}
 commands = sphinx-build -a -E -W -d releasenotes/build/doctrees -b html releasenotes/source releasenotes/build/html
 
-[testenv:lower-constraints]
-deps =
-  -c{toxinidir}/lower-constraints.txt
-  -r{toxinidir}/test-requirements.txt
-  -r{toxinidir}/requirements.txt
-
 [flake8]
 show-source = true
 exclude = .tox,dist,doc,*.egg,build