task/ta-142 -- ADP bulk updater -- stub the update method

top/adp.py
* stubbed out new method update() that will be used to update the ADP
  DB details

top/adpdaemon.py
* new attribute "mode" that defines the mode of operation
* add new parameter "mode" to top.AdpDaemon __init__
* update the _start() method so that the call to Adp.process() includes
  the "mode" attribute value as a parameter call

top/bin/topadpd
* add new command line option, --update
* add logic to translate the value of the --update flag into a "mode"
  context
* call to the AdpDaemon() object includes the "mode" context