new queue option, penaltymemberslimit, disregards penalty on too few queue members when enabled 

(closes issue #14559)
Reported by: fiddur
Patches:
      trunk-199584-1.diff uploaded by fiddur (license 678)
Tested by: fiddur, dvossel


git-svn-id: https://origsvn.digium.com/svn/asterisk/trunk@233196 65c4cc65-6c06-0410-ace0-fbb531ad65f3