copr-builder: enable and infra-stg repo @copr/copr-dev on staging builders

...also remove commented out swapon /dev/vda lines as the /dev/vdb is
already used as swap in the f27 images

roles/copr/backend/files/provision/builderpb_nova.yml

@@ -37,6 +37,9 @@
   sudo: True
   user: fedora
 
+  vars_files:
+    - nova_cloud_vars.yml
+
   vars:
     # pass this options if you need to create new base image from snapshot
     #prepare_base_image: True

roles/copr/backend/files/provision/builderpb_nova_ppc64le.yml

@@ -37,14 +37,14 @@
   sudo: True
   user: fedora
 
+  vars_files:
+    - nova_cloud_vars.yml
+
   vars:
     # pass this options if you need to create new base image from snapshot
     #prepare_base_image: True
 
   tasks:
-    #- name: swap on /dev/vda 100GB volume for tmpfs mock plugin
-    #command: swapon /dev/vda
-
   - include: "provision_builder_tasks.yml"
 
   - name: disable offloading

roles/copr/backend/files/provision/provision_builder_tasks.yml

@@ -3,7 +3,7 @@
 
 - name: put infra stg repos into yum.repos.d if staging
   copy: src=files/dnf/infra-tags-stg.repo dest=/etc/yum.repos.d
-  when: ansible_hostname == "copr-be-dev"
+  when: network_name == "coprdev-net"
 
 - name: disable updates-testing
   file:
@@ -44,6 +44,10 @@
 - name: disable @copr/copr explicitly
   shell: dnf copr -y disable @copr/copr
 
+- name: enable @copr/copr-dev in staging
+  copy: dnf copr -y enable @copr/copr-dev
+  when: network_name == "coprdev-net"
+
 - name: make sure newest rpm
   dnf: state=latest pkg={{ item }}
   with_items: