Merge remote-tracking branch 'luiz/queue/qmp' into staging

# By Wenchao Xia (15) and Stefan Weil (1)
# Via Luiz Capitulino
* luiz/queue/qmp:
  monitor: improve auto complete of "help" for single command in sub group
  monitor: allow "help" show message for single command in sub group
  monitor: support sub command in auto completion
  monitor: refine monitor_find_completion()
  monitor: support sub command in help
  monitor: refine parse_cmdline()
  monitor: code move for parse_cmdline()
  monitor: avoid direct use of global variable *mon_cmds
  monitor: split off monitor_data_init()
  monitor: call sortcmdlist() only one time
  monitor: avoid use of global *cur_mon in readline_completion()
  monitor: avoid use of global *cur_mon in monitor_find_completion()
  monitor: avoid use of global *cur_mon in block_completion_it()
  monitor: avoid use of global *cur_mon in file_completion()
  monitor: avoid use of global *cur_mon in cmd_completion()
  monitor: Add missing attributes to local function

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