Add a subquery example for the /nodes endpoint

Good to have an example for this as you have to extract the "certname" and
match it to "name" here as opposed to the other endpoints.
Merge pull request #435 from dalen/node_subquery

Add a subquery example for the /nodes endpoint
(#19239) Work around EOFException upon journal corruption

We discovered a bug in KahaDB that when the journal is corrupted there might be
a stray EOFException that is not caught by the KahaDB store, however upon
broker restart it corrects itself.

This patch will automatically restart the broker when that state is detected,
avoiding the need for an administrator to intervene.

Signed-off-by: Ken Barber <ken@bob.sh>