Right now, the accumulo scripts presume that invocation always happens on a node in the cluster. This makes integrating with external cluster management software more difficult.
The primary issue is that bin/config.sh expects to find a full cluster configuration directory at all times. In the case of a configuration directory that doesn't specify any hosts it takes steps to set up a standalone cluster. That effort is unneeded and undesirable if we're just e.g. trying to go through init from a non-participant host.
Add an optional environment variable to have config.sh just verify the invariants needed for bin/accumulo to behave correctly. When present, don't make local directories or write to files.