Run all but Zaza jobs in parallel

Only Zaza jobs are resource-constrained and need to be run one at a
time.

The rest of the jobs can be run in parallel.

Change-Id: I77d3b141d476edca5fdc5d3ea2ddacc1a30f311c
diff --git a/nodepool/nodepool.yaml b/nodepool/nodepool.yaml
index e197857..cdc1810 100644
--- a/nodepool/nodepool.yaml
+++ b/nodepool/nodepool.yaml
@@ -42,7 +42,9 @@
 labels:
   - name: centos-base
     min-ready: 0
-  - name: os-ubuntu-focal
+  - name: charm-main-os-ubuntu-focal
+    min-ready: 0
+  - name: charm-zaza-os-ubuntu-focal
     min-ready: 0
 providers:
   - name: openstack-testing
@@ -68,7 +70,20 @@
             flavor-name: m1.xlarge
             boot-from-volume: True
             volume-size: 80
-      - name: zaza-main
+      - name: charm-main
+        max-servers: 4
+        auto-floating-ip: False
+        security-groups:
+          - pp-net
+          - "Remote Access"
+        networks:
+          - lab-charmed-testing-ssh
+        labels:
+          - name: charm-main-os-ubuntu-focal
+            flavor-name: m1.small
+            cloud-image: ubuntu-focal
+            key-name: spfactory-zuul-nodepool-key
+      - name: charm-zaza
         max-servers: 1
         auto-floating-ip: False
         security-groups:
@@ -77,7 +92,7 @@
         networks:
           - lab-charmed-testing-ssh
         labels:
-          - name: os-ubuntu-focal
+          - name: charm-zaza-os-ubuntu-focal
             flavor-name: m1.small
             cloud-image: ubuntu-focal
             key-name: spfactory-zuul-nodepool-key