CI: balance groups (#548)

* Show timings with devel, and skip everything else.

* Move to other group.

* Try smaller SSH key size (i.e. make tests run faster).

* Add implicit size that now must be explicit.

* Change group of luks_device.

* Revert "Show timings with devel, and skip everything else."

This reverts commit 7b73f7e4d7.

tests/integration/targets/openssh_cert/tasks/main.yml

@@ -18,7 +18,7 @@
   openssh_keypair:
     path: "{{ signing_key }}"
     type: rsa
-    size: 2048
+    size: 1024
 
 - block:
     - name: Import idempotency tests