Ignore ZCLOSING errors when creating ephemeral nodes and watches.
Ignore ZCLOSING errors when creating ephemeral nodes and watches.

It's safe to ignore these, since `runHooks` will recreate the ephemeral
nodes and watches as soon as we've reconnected. By not ignoring these,
we were triggering "Disconnecting from zookeeper because of error" in
the `run` loop.

stripe/sequins,stripe/sequins