Update nodepool zk configs to be a bit less confusing

Our system-config roles for nodepool update the zookeeper configuration
for our nodepool hosts. The content in the files here is merely a
placeholder. Make that more apparent via the addition of comments and
use of dummy data.

Change-Id: I4e35088a04f6393409963f841f2e9ba174c69598

nodepool/nb03.opendev.org.yaml

@@ -1,13 +1,15 @@
 elements-dir: /etc/nodepool/elements
 images-dir: /opt/nodepool_dib
 
+# This portion of the config is updated by ansible to use the actual
+# zookeeper servers.
 zookeeper-servers:
-  - host: zk01.openstack.org
-    port: 2181
-  - host: zk02.openstack.org
-    port: 2181
-  - host: zk03.openstack.org
-    port: 2181
+  - host: zk01.example.org
+    port: 2281
+  - host: zk02.example.org
+    port: 2281
+  - host: zk03.example.org
+    port: 2281
 
 providers:
   - name: linaro-us

nodepool/nl01.opendev.org.yaml

@@ -1,13 +1,15 @@
 elements-dir: /etc/nodepool/elements
 images-dir: /opt/nodepool_dib
 
+# This portion of the config is updated by ansible to use the actual
+# zookeeper servers.
 zookeeper-servers:
-  - host: zk01.openstack.org
-    port: 2181
-  - host: zk02.openstack.org
-    port: 2181
-  - host: zk03.openstack.org
-    port: 2181
+  - host: zk01.example.org
+    port: 2281
+  - host: zk02.example.org
+    port: 2281
+  - host: zk03.example.org
+    port: 2281
 
 # NOTE(pabelanger): To avoid a race conditions between multiple launchers, only
 # nl01.o.o will manage min-ready of our labels.  If nl01.o.o is ever disabled,

nodepool/nl02.opendev.org.yaml

@@ -1,13 +1,15 @@
 elements-dir: /etc/nodepool/elements
 images-dir: /opt/nodepool_dib
 
+# This portion of the config is updated by ansible to use the actual
+# zookeeper servers.
 zookeeper-servers:
-  - host: zk01.openstack.org
-    port: 2181
-  - host: zk02.openstack.org
-    port: 2181
-  - host: zk03.openstack.org
-    port: 2181
+  - host: zk01.example.org
+    port: 2281
+  - host: zk02.example.org
+    port: 2281
+  - host: zk03.example.org
+    port: 2281
 
 # NOTE(pabelanger): To avoid a race conditions between multiple launchers, only
 # nl01.o.o will manage min-ready of our labels.  If nl01.o.o is ever disabled,

nodepool/nl03.opendev.org.yaml

@@ -1,13 +1,15 @@
 elements-dir: /etc/nodepool/elements
 images-dir: /opt/nodepool_dib
 
+# This portion of the config is updated by ansible to use the actual
+# zookeeper servers.
 zookeeper-servers:
-  - host: zk01.openstack.org
-    port: 2181
-  - host: zk02.openstack.org
-    port: 2181
-  - host: zk03.openstack.org
-    port: 2181
+  - host: zk01.example.org
+    port: 2281
+  - host: zk02.example.org
+    port: 2281
+  - host: zk03.example.org
+    port: 2281
 
 # NOTE(pabelanger): To avoid a race conditions between multiple launchers, only
 # nl01.o.o will manage min-ready of our labels.  If nl01.o.o is ever disabled,

nodepool/nl04.opendev.org.yaml

@@ -1,13 +1,15 @@
 elements-dir: /etc/nodepool/elements
 images-dir: /opt/nodepool_dib
 
+# This portion of the config is updated by ansible to use the actual
+# zookeeper servers.
 zookeeper-servers:
-  - host: zk01.openstack.org
-    port: 2181
-  - host: zk02.openstack.org
-    port: 2181
-  - host: zk03.openstack.org
-    port: 2181
+  - host: zk01.example.org
+    port: 2281
+  - host: zk02.example.org
+    port: 2281
+  - host: zk03.example.org
+    port: 2281
 
 # NOTE(pabelanger): To avoid a race conditions between multiple launchers, only
 # nl01.o.o will manage min-ready of our labels.  If nl01.o.o is ever disabled,

nodepool/nodepool.yaml

@@ -1,13 +1,15 @@
 elements-dir: /etc/nodepool/elements
 images-dir: /opt/nodepool_dib
 
+# This portion of the config is updated by ansible to use the actual
+# zookeeper servers.
 zookeeper-servers:
-  - host: zk01.openstack.org
-    port: 2181
-  - host: zk02.openstack.org
-    port: 2181
-  - host: zk03.openstack.org
-    port: 2181
+  - host: zk01.example.org
+    port: 2281
+  - host: zk02.example.org
+    port: 2281
+  - host: zk03.example.org
+    port: 2281
 
 providers:
   - name: ovh-bhs1