Race condition on RoxieLocalState file

Roxie stores its localstate in the queries directory, which is shared and therefore liable to be overwritten/have race conditions with other pods.

We need to rethink the purpose/location of this file in a cloud context. If it's in ephemeral storage it may be completely pointless (it helps a roxie restart when dali is down/disconnected), but if it's persistent, we need to work out whether it is actually the same for all channels/nodes and if so how we can ensure it's only written by one.