Blacklist stestr 3.0.0 and drop pypy

stestr 3.0.0 does not support python 2.7 but has been released without
the proper metadata to reflect that. As a result, there is a python2 wheel
stestr-3.0.0-py2-none-any.whl which get picked up.

Blacklist stestr 3.0.0 to fix '--list': no such option error

Drop pypy testing since pypy jobs are always failling.

Signed-off-by: Antoine Musso <hashar@free.fr>
Signed-off-by: Andreas Jaeger <aj@suse.com>
Change-Id: Ia2f7c814f21c78f29ec9024997469625f92bc401

.zuul.yaml

@@ -18,8 +18,6 @@
       jobs:
         - openstack-tox-linters
         - openstack-tox-py27
-        - openstack-tox-pypy:
-            nodeset: ubuntu-bionic
         - jjb-tox-cross-jenkins-job-builder
     gate:
       jobs:

test-requirements.txt

@@ -8,7 +8,7 @@ requests-mock>=1.4.0
 requests-kerberos
 sphinx>=1.6.0,<2.0.0;python_version=='2.7'  # BSD
 sphinx>=1.6.0;python_version>='3.4'  # BSD
-stestr>=2.0.0
+stestr>=2.0.0,!=3.0.0
 testscenarios
 testtools
 pre-commit

tox.ini

@@ -1,7 +1,7 @@
 [tox]
 minversion = 2.0
 skipsdist = True
-envlist = py{34,27,35,36}, linters, pypy
+envlist = py{34,27,35,36}, linters
 
 [testenv]
 setenv =