dipc_ctrl_thread_run needs to be atomically checked

[doctorlai-msrc]

In here the dipc_ctrl_thread_run is not atomically checked, which may cause problem if this variable is updated in multiple places at the same time.

[jsk1004ha]

I am working on the IPC control-thread lifecycle: atomic run-state access, startup failure propagation, a real primary stop/join path, and functional shutdown regression coverage.