Revert "[DCAE] Set 3.9 for tox run"

This reverts commit b39543603f98c745ece0f049644f6583a64d6195.

Reason for revert: 3.9 not supported under CI
ERROR: unknown environment 'py3.9' reported in logs

Change-Id: Iacfd5c3c9bcc64eeaebd0be73610e6347f3a0531
Signed-off-by: vv770d <vv770d@att.com>
Issue-ID: DCAEGEN2-3236
diff --git a/jjb/dcaegen2/dcaegen2-services-docker-python-subprojects.yaml b/jjb/dcaegen2/dcaegen2-services-docker-python-subprojects.yaml
index 77099cc..3f37a13 100644
--- a/jjb/dcaegen2/dcaegen2-services-docker-python-subprojects.yaml
+++ b/jjb/dcaegen2/dcaegen2-services-docker-python-subprojects.yaml
@@ -41,7 +41,7 @@
     docker-get-container-tag-script: '../../shell/docker-ts-tag-override.sh'
     nexus-iq-namespace: 'onap-'
     tox-dir: '{src-dir}'
-    tox-envs: 'py3.9'
+    tox-envs: 'py3'
     sonarcloud: true
     sonarcloud-project-organization: '{sonarcloud_project_organization}'
     sonarcloud-api-token: '{sonarcloud_api_token}'