Helper bucketpath tool.
No longer mixing server and CLI into one program.

So, the subcommands are gone.  The bucket-path subcommand had been
replaced in a previous commit with a tool/bucketpath utility program.

Because of this, the -verbosity int flag has now also been simplified
into just a -v bool flag.

cbugg: close bug-465

Current-h / help output...

    $ ./cbgb/cbgb -h
    usage: ./cbgb/cbgb <flags>

    flags:
      -addr=":11211": data protocol listen address
      -data="./tmp": data directory
      -default-bucket-name="default": name of the default bucket ("" disables)
      -default-persistence=2: persistence level for default bucket
      -default-quota=100MB: quota for default bucket
      -num-partitions=1: default number of partitions for new buckets
      -rest=":DISABLED": rest protocol listen address
      -static-path="static": path to static web UI content
      -v=true: amount of logging

    persistence levels:
      2: metadata persisted and ops persisted
      1: metadata persisted and ops not persisted
      0: nothing persisted