Add Python 3.8 to ansible-test and CI.

shippable.yml

@@ -18,6 +18,7 @@ matrix:
     - env: T=units/3.5
     - env: T=units/3.6
     - env: T=units/3.7
+    - env: T=units/3.8
 
     - env: T=windows/2008/1
     - env: T=windows/2008-R2/1

test/runner/completion/docker.txt

@@ -1,4 +1,4 @@
-default name=quay.io/ansible/default-test-container:1.4.1 python=3
+default name=quay.io/ansible/default-test-container:1.5.1 python=3
 centos6 name=quay.io/ansible/centos6-test-container:1.4.0 seccomp=unconfined
 centos7 name=quay.io/ansible/centos7-test-container:1.4.0 seccomp=unconfined
 fedora28 name=quay.io/ansible/fedora28-test-container:1.5.0

test/runner/lib/executor.py

@@ -118,6 +118,7 @@ SUPPORTED_PYTHON_VERSIONS = (
     '3.5',
     '3.6',
     '3.7',
+    '3.8',
 )
 
 HTTPTESTER_HOSTS = (

test/utils/shippable/windows.sh

@@ -20,6 +20,7 @@ python_versions=(
     3.5
     3.6
     3.7
+    3.8
     2.7
 )