1. switch to use -publicIp instead of -publicUrl
2. -ip can be empty. It will listen to all available interfaces.
3. For "weed master", these options are changed:
-masterPort => -master.port
-peers => -master.peers
-mdir => -master.dir
-volumeSizeLimitMB => -master.volumeSizeLimitMB
-conf => -master.conf
-defaultReplicaPlacement => -master.defaultReplicaPlacement
-port => -volume.port
-max => -volume.max
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