Resolve warning filter issues

There's an issue with 'pkgutils' and namespace packages. This has been
reported against setuptools [1], but until this is resolved, we simply
need to live with it. Ensure said warnings are filtered from tox too and
remove some unnecessary ones.

[1] https://github.com/pypa/setuptools/issues/1111

Signed-off-by: Stephen Finucane <stephen@that.guru>

1 files changed, 1 insertions, 0 deletions

diff --git a/tox.ini b/tox.ini
index 0d19225f8..99e243ad6 100644
--- a/tox.ini
+++ b/tox.ini
@@ -20,6 +20,7 @@ deps =
     du13: docutils==0.13.1
     du14: docutils==0.14
 setenv =
+    PYTHONWARNINGS = all,ignore::ImportWarning:pkgutil
     SPHINX_TEST_TEMPDIR = {envdir}/testbuild
 commands=
     pytest -Wall --durations 25 {posargs}