Remove lower-constraints remnants

These were missed in change : Icd090cf8a36fa560bf7b0c67d0e1c4923c221c65

Change-Id: I07b577f4e948c03d1751145e5f898b90ac1c197a

lower-constraints.txt

@@ -1,61 +0,0 @@
-alembic==0.9.6
-appdirs==1.3.0
-Babel==2.3.4
-bandit==1.4.0
-cffi==1.14.0
-cliff==2.8.0
-cmd2==0.8.0
-coverage==4.0
-debtcollector==1.2.0
-decorator==3.4.0
-eventlet==0.18.2
-extras==1.0.0
-fixtures==3.0.0
-future==0.16.0
-gitdb==0.6.4
-GitPython==1.0.1
-greenlet==0.4.15
-iso8601==0.1.11
-keystoneauth1==3.4.0
-linecache2==1.0.0
-Mako==0.4.0
-MarkupSafe==1.1.1
-monotonic==0.6
-netaddr==0.7.18
-netifaces==0.10.4
-os-client-config==1.28.0
-oslo.config==5.2.0
-oslo.context==2.19.2
-oslo.i18n==3.15.3
-oslo.utils==3.33.0
-oslotest==3.2.0
-pbr==2.0.0
-pifpaf==0.10.0
-prettytable==0.7.2
-psycopg2==2.8.0
-pycparser==2.18
-PyMySQL==0.7.6
-pyparsing==2.1.0
-pyperclip==1.5.27
-python-editor==1.0.3
-python-mimeparse==1.6.0
-python-subunit==1.0.0
-pytz==2013.6
-PyYAML==3.13
-requests==2.14.2
-requestsexceptions==1.2.0
-rfc3986==0.3.1
-smmap==0.9.0
-SQLAlchemy==1.2.0
-sqlalchemy-migrate==0.11.0
-sqlparse==0.2.2
-stevedore==1.20.0
-Tempita==0.5.2
-testrepository==0.0.18
-stestr==2.0.0
-testresources==2.0.0
-testscenarios==0.4
-testtools==2.2.0
-traceback2==1.4.0
-wrapt==1.7.0
-xattr==0.9.2

tox.ini

@@ -82,8 +82,3 @@ deps = bindep
 commands = bindep test
 usedevelop = False
 
-[testenv:lower-constraints]
-deps =
-  -c{toxinidir}/lower-constraints.txt
-  -r{toxinidir}/test-requirements.txt
-  -r{toxinidir}/requirements.txt