Change the name of config file entries for keypad regions

from 'keypad_entry' to 'region'. Fix the example file accordingly.
Also make some fixes in the code do reset entries on reload of the keypad.

The recently committed kpad2.jpg has the correct names.



git-svn-id: https://origsvn.digium.com/svn/asterisk/trunk@94638 65c4cc65-6c06-0410-ace0-fbb531ad65f3