PyPlugin fixes and cleanup for proc_trace example #1089

Job	Run time
test_installer	1h 19m 4s
build_container	14m 28s
build_and_check_fork	0s
make_check (check-qtest-x86_64)	1m 50s
make_check (check-qtest-i386)	1m 52s
make_check (check-qtest-arm)	1m 13s
make_check (check-qtest-mips)	37s
make_check (check-qtest-mipsel)	37s
make_check (check-qtest-ppc)	47s
make_check (check-block)	1m 24s
make_check (check-unit)	1m 18s
make_check (check-qapi-schema)	11s
sym_trace_tests (x86_64)	8s
taint_tests (i386)	52m 39s
taint_tests (x86_64)	6m 39s
pypanda_tests (dyn_hooks)	9s
pypanda_tests (copy_test)	15s
pypanda_tests (file_fake)	6s
pypanda_tests (file_hook)	7s
pypanda_tests (generic_tests)	1m 52s
pypanda_tests (monitor_cmds)	8s
pypanda_tests (multi_proc_cbs)	3m 7s
pypanda_tests (sleep_in_cb)	15s
pypanda_tests (syscalls)	17s
pypanda_tests (record_no_snap)	12s
pypanda_tests (sig_suppress)	19s
cleanup	2s
	2h 49m 36s

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