Ensure executor also as keystore.password setting

Hopefully make the upgrade notes a little better for others.

Change-Id: Iab12cb99bad21535ee46c55829b9584067e6a6da
Signed-off-by: Paul Belanger <pabelanger@redhat.com>

doc/source/discussion/components.rst

@@ -312,7 +312,6 @@ The following sections of ``zuul.conf`` are used by the scheduler:
 
       Encryption password for private data stored in Zookeeper.
 
-
 .. attr:: scheduler
 
    .. attr:: command_socket
@@ -867,6 +866,13 @@ The following sections of ``zuul.conf`` are used by the executor:
       perform merge operations for any events. The executor will still perform
       the merge operations required for the build they are executing.
 
+.. attr:: keystore
+
+   .. attr:: password
+      :required:
+
+      Encryption password for private data stored in Zookeeper.
+
 .. attr:: merger
 
    .. attr:: git_user_email

releasenotes/notes/zookeeper-key-storage-a1ad32aa8d63b05f.yaml

@@ -11,4 +11,5 @@ upgrade:
   - |
     As project secrets keys and SSH keys are stored encrypted in Zookeeper the
     new :attr:`keystore.password` option in ``zuul.conf`` is
-    required. Please add it to your configuration.
+    required. Please add it to your configuration for both the scheduler and
+    executor.