Chunk and meta server: omit [allocated] file ids with chunk server hello message by default, in order to save bandwidth, memory, cpu, and speedup chunk server hello processing. For backward compatibility the meta server supports both variants of chunk server hello message: with and without file ids. The chunk server default is to omit file ids. Parameter chunkServer.meta.noFids = 0 can be used to force chunk server to use the hello variant with file ids.