* rt/aio.h (struct aioinit): Replace one aio_reserved value with
aio_idle_time.
* rt/aio_misc.c: Rewrite to not automatically terminate worker threads
after the operation is done. Let them linger for a user-definable
time.
* rt/aio_cancel.c: Likewise.
Patch by Willian M Shubert <william.m.shubert@intel.com>.