feat(ci): optimize Molecule VM creation

- reuse validated runner-owned Vagrant linked-clone masters\n- create the default guests in bounded two-machine batches\n- capture create timing and runner utilization diagnostics

molecule/default/molecule.yml

@@ -89,6 +89,7 @@ provisioner:
   env:
     ANSIBLE_VERBOSITY: 1
   playbooks:
+    create: create.yml
     converge: ../resources/converge.yml
     side_effect: ../resources/reset.yml
     verify: ../resources/verify.yml