iothread: replace fair_mutex with a condition variable
This conveys the intention better, and scales to more than >1 threads contending the mutex with the iothread (as long as all of them have a "quiescent point" like the TCG thread has). Also, on Mac OS X the fair_mutex somehow didn't work as intended and deadlocked. Signed-off-by: NPaolo Bonzini <pbonzini@redhat.com> Tested-by: NAlexander Graf <agraf@suse.de> Signed-off-by: NAnthony Liguori <aliguori@us.ibm.com>
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