localbookie cannot be started with a ledger path which isn't on the root level #1927
Description
74bd926 allowed the client to overwrite localbookie configurations from conf/bk_server.conf
However, if you set the zkLedgersRootPath to something like /messaging/bookkeeper/ledgers, it will fail because it doesn't create the parent znodes (and there's no other way to do it since this is localbookie, and it only lives for the lifetime of the process).