li longyu

(hipStreamDestory)Memory Leak Fix!!! Find by valgrind

1

``` bool HostQueue::terminate() { ..... // Wake-up the command loop, so it can exit { ScopedLock sl(queueLock_); thread_.acceptingCommands_ = false; queueLock_.notify(); } // FIXME_lmoriche: fix termination handshake while (thread_.state() <...