test: verify finit restarts crashing services & registers new PID

We extend the service.sh to emulate a well behaving service that creates
and removes its own PID file.

The new test emulates a crash by sending SIGKILL to service.sh.  We then
verify that Finit restarts it, and eventually registers the new PID when
the services recreates the PID file.

Issue #226

Signed-off-by: Joachim Wiberg <troglobit@gmail.com>

test/Makefile.am

@@ -26,6 +26,7 @@ TESTS			+= add-remove-dynamic-service.sh
 TESTS			+= add-remove-dynamic-service-sub-config.sh
 TESTS			+= start-stop-service.sh
 TESTS			+= start-stop-service-sub-config.sh
+TESTS			+= start-kill-service.sh
 
 clean-local:
 	-rm -rf $(builddir)/tenv-root/