Update the ParkedCall application to grab the first available parked call if no

parked extension is provided as an argument.

(closes issue #10803)
Reported by: outtolunc
Patches: 
      res_features-parkedcall-any.diff4 uploaded by outtolunc (license 237)
	  - modified by me to work a bit differently ...


git-svn-id: https://origsvn.digium.com/svn/asterisk/trunk@89250 65c4cc65-6c06-0410-ace0-fbb531ad65f3