taskotron: update dev to buildbot 1.7, Python3

Merges: https://pagure.io/fedora-qa/qa-ansible/pull-request/6

roles/taskotron/resultsdb-frontend/tasks/main.yml

@@ -2,19 +2,22 @@
 - name: start httpd (provided in the apache role)
   service: name=httpd state=started
 
-- name: ensure packages required for resultsdb_frontend are installed (yum)
-  package: name={{ item }} state=present
-  when: ansible_distribution_major_version|int < 22
-  with_items:
-    - resultsdb_frontend
-    - mod_wsgi
-
+- name: ensure packages required for resultsdb_frontend are installed (dnf)
+  dnf: name={{ item }} state=present
+  with_items:
+    - resultsdb_frontend
+    - python3-mod_wsgi
+  when: ansible_cmdline.ostree is not defined and and deployment_type in ['dev']
+
+###########
+## TODO: remove when transition to buildbot 1.7 is complete
 - name: ensure packages required for resultsdb_frontend are installed (dnf)
   dnf: name={{ item }} state=present
   with_items:
     - resultsdb_frontend
     - mod_wsgi
-  when: ansible_distribution_major_version|int > 21 and ansible_cmdline.ostree is not defined
+  when: ansible_cmdline.ostree is not defined and deployment_type in ['stg', 'prod']
+###########
 
 - name: ensure selinux lets httpd talk to the network
   seboolean: name=httpd_can_network_connect persistent=yes state=yes