test failure due to wrong assumption that SIGUSR1's value is the same on all architectures

upstart 1.10 (1.9 and later) fails to build on mips, and mipsel because the value of reload_signal is serialized as an integer, and test_reload_signal_state in init/tests/test_state.c assumes that the value encoded in the json file (10) is equal to SIGUSR1 on the target platform. This is not true. The only values for signals that are guaranteed to be consistent across all platforms are 1, 2, 3, 6, 9, 14, and 15 (SIGHUP, SIGINT, SIGQUIT, SIGABRT, SIGKILL, SIGALRM, SIGTERM).

There's nothing wrong with the serialization format, here; there's no risk that when re-execing upstart we'll come up on a system that has different signal definitions. But the test needs to be fixed, so that it's comparing with an integer, not with a define whose value is different on different architectures.