Update tox configuration

The whitelist_externals option has been renamed to allowlist_externals.

Signed-off-by: Lubomír Sedlář <lsedlar@redhat.com>
(cherry picked from commit ba613563f6)

tox.ini

@@ -4,7 +4,7 @@ envlist = bandit, flake8, black, py27, py3
 [testenv:flake8]
 deps =
     flake8
-whitelist_externals = sh
+allowlist_externals = sh
 commands =
     sh -c "flake8 pungi pungi_utils setup.py tests/*py"
 
@@ -18,7 +18,7 @@ ignore_outcome = True
 
 [testenv:black]
 basepython = python3
-whitelist_externals = sh
+allowlist_externals = sh
 deps =
     {[testenv:flake8]deps}
     black
@@ -31,7 +31,7 @@ sitepackages = true
 deps =
     -rrequirements.txt
     -rtest-requirements.txt
-whitelist_externals =
+allowlist_externals =
     sh
     make
     coverage
@@ -46,7 +46,7 @@ sitepackages = true
 deps =
     -rrequirements.txt
     -rtest-requirements.txt
-whitelist_externals =
+allowlist_externals =
     sh
 commands =
     sh -c 'find . -name "__pycache__" -exec rm -rf \{\} +'