Adopt commit 4a081c8 from master: Merge pull request #588 from nmyers12/bdmlt-timereventscheduler-cancelevent-invalidhandle-drqs-81836895
Adopt commit 4a081c8 from master: Merge pull request #588 from nmyers12/bdmlt-timereventscheduler-cancelevent-invalidhandle-drqs-81836895

commit 4a081c85d33b6de697010485a20e04b6fbba0b16
Merge: 50e1f2e 72f33ac
Author: Henry Verschell <hverschell@bloomberg.net>
Date:   Wed Aug 3 18:26:19 2016 -0400

    Merge pull request #588 from nmyers12/bdmlt-timereventscheduler-cancelevent-invalidhandle-drqs-81836895

    bdlmt::TimerEventScheduler::cancelEvent with Invalid handle drqs 81836895

commit 72f33ac52ceec24bb22e33201288aed6b90cab2f
Author: Nathan Myers <nmyers12@bloomberg.net>
Date:   Tue Jul 26 18:33:13 2016 -0400

    bdlmt::TimerEventScheduler::cancelEvent with e_InvalidHandle drqs 81836895

bloomberg/bde,bowlofstew/bde,bloomberg/bde,apaprocki/bde,bloomberg/bde,dharesign/bde,dharesign/bde,che2/bde,dharesign/bde,dharesign/bde,che2/bde,apaprocki/bde,apaprocki/bde,apaprocki/bde,bloomberg/bde,bowlofstew/bde,bloomberg/bde,apaprocki/bde,bowlofstew/bde,che2/bde,che2/bde,bowlofstew/bde