Add new callback for QMP events #1256

Job	Run time
build_container	9m 38s
test_installer	49m 54s
build_and_check_fork	0s
taint_tests (i386)	54m 31s
make_check (check-qtest-x86_64)	2m 1s
taint_tests (x86_64)	7m 9s
pypanda_tests (dyn_hooks)	10s
make_check (check-qtest-i386)	2m 1s
make_check (check-qtest-arm)	1m 17s
sym_trace_tests (x86_64)	8s
make_check (check-qtest-mips)	37s
make_check (check-qtest-mipsel)	38s
make_check (check-qtest-ppc)	47s
pypanda_tests (copy_test)	13s
make_check (check-block)	1m 37s
pypanda_tests (file_fake)	7s
make_check (check-unit)	1m 21s
pypanda_tests (file_hook)	9s
pypanda_tests (generic_tests)	2m 14s
make_check (check-qapi-schema)	10s
pypanda_tests (monitor_cmds)	10s
pypanda_tests (multi_proc_cbs)	19s
pypanda_tests (sleep_in_cb)	10s
pypanda_tests (syscalls)	10s
pypanda_tests (record_no_snap)	12s
pypanda_tests (sig_suppress)	22s
cleanup	2s
	2h 16m 7s

Provide feedback