diskimage-create: Fix tox.ini not compatible with tox 4.x

Change-Id: I24e1a7059c7ed1bdfe0f287c81148db912ce52a9

diskimage-create/tox.ini

@@ -1,36 +1,53 @@
 [tox]
-minversion = 1.8
+minversion = 3.18
 envlist = bashate,docs,build,test
-skipsdist = True
 
 [testenv]
 basepython = python3
 envdir = {toxworkdir}/venv
 setenv = VIRTUAL_ENV={envdir}
-passenv = http_proxy HTTP_PROXY https_proxy HTTPS_PROXY no_proxy NO_PROXY DIB_* CLOUD_INIT_DATASOURCES OCTAVIA_REPO_PATH
+passenv =
+    http_proxy
+    HTTP_PROXY
+    https_proxy
+    HTTPS_PROXY
+    no_proxy
+    NO_PROXY
+    DIB_*
+    CLOUD_INIT_DATASOURCES
+    OCTAVIA_REPO_PATH
 install_command = pip install -U {opts} {packages}
 deps = -r{toxinidir}/requirements.txt
        -r{toxinidir}/test-requirements.txt
-whitelist_externals =   virt-filesystems
-                        virt-inspector
-                        awk
-                        mkdir
-                        rm
+allowlist_externals =
+    virt-filesystems
+    virt-inspector
+    awk
+    mkdir
+    rm
 
 [testenv:docs]
 commands = doc8 README.rst ../elements/haproxy-octavia/README.rst ../elements/root-passwd/README.rst
 
 [testenv:bashate]
-commands = bashate diskimage-create.sh
-            bashate image-tests.sh
+commands =
+    bashate diskimage-create.sh
+    bashate image-tests.sh
 
 [testenv:build]
 # NOTE: specify cache directory explicitly with -c as the `diskimage-create.sh`
 # default is based off of `$HOME` which is not passed on in a `tox` environment.
-commands =  ./diskimage-create.sh -o {toxinidir}/amphora-x64-haproxy -w {toxworkdir} -c {toxworkdir}/.cache
+commands =
+    ./diskimage-create.sh -o {toxinidir}/amphora-x64-haproxy -w {toxworkdir} -c {toxworkdir}/.cache
+allowlist_externals =
+    ./diskimage-create.sh
+
 
 [testenv:test]
 # Work around tox limitations with command pipes
 # https://bitbucket.org/hpk42/tox/issue/73/pipe-output-of-command-into-file
-commands =  ./image-tests.sh {toxinidir}/.amp_tox_test
-            rm -rf {toxinidir}/.amp_tox_test
+commands =
+    ./image-tests.sh {toxinidir}/.amp_tox_test
+    rm -rf {toxinidir}/.amp_tox_test
+allowlist_externals =
+    ./image-tests.sh