Fixes issue with hints giving unexpected results.

Fixes issue with hints giving unexpected results.

Hints with two or more devices that include ONHOLD gave unexpected results.

(closes issue #15057)
Reported by: p_lindheimer
Patches:
      onhold_trunk.diff uploaded by dvossel (license 671)
      pbx.c.1.4.patch uploaded by p (license 558)
      devicestate.c.trunk.patch uploaded by p (license 671)
Tested by: p_lindheimer, dvossel

Review: https://reviewboard.asterisk.org/r/254/

git-svn-id: https://origsvn.digium.com/svn/asterisk/branches/1.4@199297 65c4cc65-6c06-0410-ace0-fbb531ad65f3