treewide: rename qemu_wait_io_event/qemu_wait_io_event_common

Do so before extending it to the user-mode emulators, where there is no
such thing as an "I/O thread".

Reviewed-by: Richard Henderson <richard.henderson@linaro.org>
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
11 files changed