Revert "nodepool: Attempt to limit Cinder jobs to 1 at a time"

This reverts commit 9509bd2f23022d8ebe0959f6dc9e8e4ebe455f9f.

Change-Id: I2ac9fdea06d225cb3c9d8724ec4f36d1e1fa297f
diff --git a/nodepool/nodepool.yaml b/nodepool/nodepool.yaml
index d32df06..921d567 100644
--- a/nodepool/nodepool.yaml
+++ b/nodepool/nodepool.yaml
@@ -70,7 +70,7 @@
         username: ubuntu
     pools:
       - name: main
-        max-servers: 3
+        max-servers: 4
         auto-floating-ip: False
         networks:
           - lab-vlan400