copr-be: autoactivate volume group

I think this is caused by (run against the previous backend instance):
fb1acfb6fd/play-vm-migration-02-migrate-backend-box.yml (L68-L71)

roles/copr/backend/tasks/mount_fs.yml

@@ -36,7 +36,7 @@
 
     - name: scan and assemble raid volumes and activate volume groups
       when: not stat_repo_fs.stat.exists
-      shell: mdadm --assemble --scan && sleep 5 && vgchange -a y && sleep 5
+      shell: mdadm --assemble --scan && sleep 5 && vgchange -a y && vgchange copr-backend-data --setautoactivation y && sleep 5
 
     - name: stat the ext4 filesystem
       stat: path=/dev/disk/by-label/copr-repo