Drop lower-constraints

Most of the OpenStack projects, including neutron, removed testing of
lower constraints and now maintain the lower bounds on best-effort
basis.

Change-Id: Iab2fb87b32bc3a4e97826c8355e5f9c6eedcae64
Co-authored-by: Takashi Kajinami <kajinamit@oss.nttdata.com>
Signed-off-by: Ivan Anfimov <lazekteam@gmail.com>

lower-constraints.txt

@@ -1,43 +0,0 @@
-alabaster==0.7.10
-astroid==1.6.2
-Babel==2.3.4
-bashate==0.5.1
-chardet==3.0.4
-doc8==0.6.0
-docutils==0.11
-dulwich==0.15.0
-extras==1.0.0
-fixtures==3.0.0
-flake8==2.5.5
-hacking==1.1.0
-imagesize==0.7.1
-isort==4.3.4
-Jinja2==2.10
-lazy-object-proxy==1.3.1
-linecache2==1.0.0
-lxml==4.5.0
-MarkupSafe==1.1.1
-mccabe==0.2.1
-openstackdocstheme==2.2.1
-pbr==2.0.0
-pep8==1.5.7
-pyflakes==0.8.1
-Pygments==2.2.0
-pylint==1.7.1
-python-mimeparse==1.6.0
-python-subunit==1.0.0
-pytz==2013.6
-PyYAML==3.13
-reno==3.1.0
-requests==2.14.2
-restructuredtext-lint==1.1.1
-six==1.10.0
-snowballstemmer==1.2.1
-Sphinx==2.0.0
-sphinxcontrib-websupport==1.0.1
-stevedore==1.20.0
-stestr==2.0.0
-testtools==2.2.0
-traceback2==1.4.0
-unittest2==1.1.0
-wrapt==1.7.0

tox.ini

@@ -62,12 +62,3 @@ exclude=.venv,.git,.tox,dist,*lib/python*,*egg,build,doc/source/conf.py
 # 28 is currently the most complex thing we have
 max-complexity=29
 ignore = H101
-
-[testenv:lower-constraints]
-# Install also sitemap scraping tool, not installed by default
-# therefore not in requirements file
-deps =
-  scrapy>=1.0.0
-  -c{toxinidir}/lower-constraints.txt
-  -r{toxinidir}/test-requirements.txt
-  -r{toxinidir}/requirements.txt