[DAEMON-242] appcd: Global options not displayed on command help

$ appcd --help
Usage: appcd <command> [options]

Commands:
  config   get and set config options
  dump     dumps the config, status, health, and debug logs to a file
  exec     connects to the Appc Daemon and executes the request
  logcat   streams Appc Daemon debug log output
  restart  stops the Appc Daemon if running, then starts it
  start    starts the Appc Daemon if it's not already running
  status   displays the Appc Daemon status
  stop     stops the Appc Daemon if running

Global options:
  --config=<json>       serialized JSON string to mix into the appcd config
  --config-file=<file>  path to a appcd JS config file
  --no-colors           disables colors
  -h, --help            displays the help screen
  -v, --version         outputs the appcd version

$ appcd start --help
Usage: appcd start [options]

starts the Appc Daemon if it's not already running

start options:
  --debug  don't run as a background daemon