Add timeout to kernel install.

Author: jglogan

Makefile

@@ -156,7 +156,7 @@ install-kernel:
 		MONITOR_PID=$$!; \
 		echo "Monitor running with PID $$MONITOR_PID"; \
 	fi; \
-	bin/container --debug system start --timeout 60 --enable-kernel-install $(SYSTEM_START_OPTS)
+	timeout 60 bin/container --debug system start --timeout 60 --enable-kernel-install $(SYSTEM_START_OPTS)
 
 .PHONY: coverage
 coverage: init-block