Fix tox failures from new version of virtualenv and pip

New pip was released on Dec 3, 2020 which breaks downloads
from pypi for some URLs (python 3).

New virtualenv was released Dec 7 which includes that new pip.

In order for sysinv in python3 on ubuntu-bionic to pass its
tox and zuul jobs, the legacy resolver must be used.

The requirements may need to be updated in future revisions.

Closes-Bug: 1907125
Change-Id: Idecaee7d83f4cbf02454e172aa254b7d8d449141
Signed-off-by: albailey <Al.Bailey@windriver.com>
(cherry picked from commit 473e55b494)

sysinv/sysinv/sysinv/tox.ini

@@ -21,7 +21,7 @@ sitepackages = True
 whitelist_externals = bash
                       find
 
-install_command = pip install \
+install_command = pip install --use-deprecated legacy-resolver \
     -v -v -v \
     -c{toxinidir}/upper-constraints.txt \
     -c{env:UPPER_CONSTRAINTS_FILE:https://opendev.org/openstack/requirements/raw/branch/stable/stein/upper-constraints.txt} \
@@ -90,18 +90,19 @@ commands =
 # E127 continuation line over-indented for visual indent
 # E128 continuation line under-indented for visual indent
 # E402 module level import not at top of file
+# E741 ambiguous variable name
 
 ignore = H101,H102,H104,H105,H306,H401,H403,H404,H405,H701,H702,H703,
          B006,B007,B009,B010,B012,B014,B301,B306,
          W503,W504,W605,
-         E117,E126,E127,E128,E402
+         E117,E126,E127,E128,E402,E741
 exclude = build,dist,tools,.eggs
 max-line-length=120
 
 [testenv:flake8]
 basepython = python3
 deps = -r{toxinidir}/test-requirements.txt
-       flake8-bugbear
+
 commands =
   flake8 {posargs} . \
     scripts/manage-partitions \
@@ -155,10 +156,11 @@ commands = {posargs}
 # B604: Test for any function with shell equals true
 # B605: Test for starting a process with a shell
 # B607: Test for starting a process with a partial path
+# B608: Possible SQL injection vector through string-based query
 #
 # Note: 'skips' entry cannot be split across multiple lines
 #
-skips = B101,B103,B104,B105,B108,B110,B303,B307,B310,B311,B314,B318,B320,B404,B405,B408,B410,B506,B602,B603,B604,B605,B607
+skips = B101,B103,B104,B105,B108,B110,B303,B307,B310,B311,B314,B318,B320,B404,B405,B408,B410,B506,B602,B603,B604,B605,B607,B608
 exclude = tests
 
 [testenv:bandit]
@@ -170,7 +172,6 @@ commands = bandit --ini tox.ini -n 5 -r sysinv
 [testenv:pylint]
 basepython = python2.7
 sitepackages = False
-
 deps = {[testenv]deps}
        pylint
 commands =