Fix #1345: Errors in pypanda shutdown with multiple SIGINTs #1090

Job	Run time
test_installer	1h 2m 0s
build_and_check_fork	0s
build_container	9m 53s
sym_trace_tests (x86_64)	15s
pypanda_tests (dyn_hooks)	12s
pypanda_tests (copy_test)	16s
pypanda_tests (file_fake)	8s
pypanda_tests (file_hook)	6s
pypanda_tests (generic_tests)	2m 10s
pypanda_tests (monitor_cmds)	10s
pypanda_tests (multi_proc_cbs)	18s
pypanda_tests (sleep_in_cb)	6s
pypanda_tests (syscalls)	10s
pypanda_tests (record_no_snap)	15s
pypanda_tests (sig_suppress)	42s
taint_tests (i386)	49m 14s
taint_tests (x86_64)	6m 35s
make_check (check-qtest-x86_64)	1m 55s
make_check (check-qtest-i386)	1m 54s
make_check (check-qtest-arm)	1m 15s
make_check (check-qtest-mips)	36s
make_check (check-qtest-mipsel)	36s
make_check (check-qtest-ppc)	46s
make_check (check-block)	1m 29s
make_check (check-unit)	1m 16s
make_check (check-qapi-schema)	11s
cleanup	2s
	2h 22m 30s

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