Update tox.ini

This adds Python 3.8 and Ubuntu Focal support and
pins pifpaf until [1] is merged and released.

Fixes some warnings on whitelist_externals that
wasn't correct.

[1] jd/pifpaf#150

(cherry picked from commit 2d73949)

tox.ini

@@ -1,6 +1,6 @@
 [tox]
 minversion = 2.4
-envlist = py36-{postgresql,mysql}{,-file,-swift,-ceph,-s3},pep8
+envlist = {py36,py38}-{postgresql,mysql}{,-file,-swift,-ceph,-s3},pep8
 skipsdist = True
 
 [testenv]
@@ -45,35 +45,42 @@ deps =
    -e
    .[test,redis,prometheus,amqp1,{env:GNOCCHI_STORAGE_DEPS:},{env:GNOCCHI_INDEXER_DEPS:}]
    {env:GNOCCHI_TEST_TARBALLS:}
+   # TODO(tobias-urdin): Remove this pin and use pifpaf directly instead when this is
+   # merged and released https://github.com/jd/pifpaf/pull/150
+   git+https://github.com/tobias-urdin/pifpaf@51f74a3d8743a7ac33259413df7efc30df993460
    cliff!=2.9.0
    gnocchiclient>=2.8.0,!=7.0.7
 commands =
     {toxinidir}/run-tests.sh {posargs}
     {toxinidir}/run-func-tests.sh {posargs}
 
-[testenv:py36-postgresql-file-upgrade-from-4.3]
+[testenv:{py36,py38}-postgresql-file-upgrade-from-4.3]
 # We should always recreate since the script upgrade
 # Gnocchi we can't reuse the virtualenv
 recreate = True
 setenv =
   GNOCCHI_VERSION_FROM=stable/4.3
   GNOCCHI_VARIANT=test,postgresql,file
 deps =
-  pifpaf>=0.13
+  # TODO(tobias-urdin): Remove this pin and use pifpaf directly instead when this is
+  # merged and released https://github.com/jd/pifpaf/pull/150
+  git+https://github.com/tobias-urdin/pifpaf@51f74a3d8743a7ac33259413df7efc30df993460
   gnocchiclient>=2.8.0,!=7.0.7
   xattr!=0.9.4
 commands = {toxinidir}/run-upgrade-tests.sh postgresql-file
 
-[testenv:py36-mysql-ceph-upgrade-from-4.3]
+[testenv:{py36,py38}-mysql-ceph-upgrade-from-4.3]
 # We should always recreate since the script upgrade
 # Gnocchi we can't reuse the virtualenv
 recreate = True
 setenv =
   GNOCCHI_VERSION_FROM=stable/4.3
   GNOCCHI_VARIANT=test,mysql,ceph,ceph_recommended_lib
 deps =
+  # TODO(tobias-urdin): Remove this pin and use pifpaf directly instead when this is
+  # merged and released https://github.com/jd/pifpaf/pull/150
+  git+https://github.com/tobias-urdin/pifpaf@51f74a3d8743a7ac33259413df7efc30df993460
   gnocchiclient>=2.8.0,!=7.0.7
-  pifpaf[ceph]>=0.13
   xattr!=0.9.4
 commands = {toxinidir}/run-upgrade-tests.sh mysql-ceph
 
@@ -82,7 +89,7 @@ basepython = python3
 deps = hacking>=0.12
 commands = flake8
 
-[testenv:py36-cover]
+[testenv:{py36,py38}-cover]
 commands = pifpaf -g GNOCCHI_INDEXER_URL run postgresql -- python setup.py testr --coverage --testr-args="{posargs}"
 
 [flake8]
@@ -108,14 +115,16 @@ commands = doc8 --ignore-path doc/source/rest.rst,doc/source/comparison-table.rs
 
 [testenv:docs-gnocchi-web]
 basepython = python3
-whitelist_externals = bash rm
+whitelist_externals =
+    /bin/bash
+    /bin/rm
 setenv = GNOCCHI_STORAGE_DEPS=file
          GNOCCHI_TEST_DEBUG=1
 install_command = pip install -U {opts} {packages}
 deps = {[testenv:docs]deps}
        setuptools
 commands =
-    rm -rf doc/build/html
+    /bin/rm -rf doc/build/html
     pifpaf -g GNOCCHI_INDEXER_URL run postgresql -- python setup.py build_sphinx
 
 [doc8]