Modified PosixThreadFactory::PThread:

Modified PosixThreadFactory::PThread:
        Pay attention to detached flags.  If thread is create non-detached and has not been joined when all references are given up,
        (ie boost::share_ptr calls ~PThread) do the join in the destructor to prevent thread ids from being leaked.

Modified ThreadFactoryTests.reapNThreads:
        Loop M times for M threads where M x N is bigger than 32K to verify that thread ids aren't leaked

Modified TimerManager.cpp:
        Removed debug messages.

Reviewed By: mcslee

Revert Plan: revertible

Test Plan: concurrency_test thread-factory passes

git-svn-id: https://svn.apache.org/repos/asf/incubator/thrift/trunk@665129 13f79535-47bb-0310-9956-ffa450edef68