NewServiceDataPathMap returns a new DataPathMap for a service which does not utilize a data dir in the container as the mon, mgr, osd, mds, and rgw service do.

we should sort the "dcs" for generate correct zone number.

StartJobCreatePool create job to create physicalpool or logicalpool.

createService create specified service according to specified dc object for example etcd, mds.

A DataPathMap is a struct which contains information about where Curve service data is stored in containers and whether the data should be persisted to the host.