AP_Arming: force user to ack crashdump or get prearm failure #573

Job	Run time
build (stm32f7, chibios, 10)	9m 22s
build (stm32h7, chibios, 10)	7m 30s
build (fmuv2-plane, chibios, 10)	3m 22s
build (periph-build, chibios, 10)	9m 19s
build (iofirmware, chibios, 10)	1m 14s
build (CubeOrange-bootloader, chibios, 10)	1m 14s
build (revo-bootloader, chibios, 10)	1m 3s
build (stm32h7-debug, chibios, 10)	4m 40s
build (fmuv3, chibios, 10)	14m 14s
build (revo-mini, chibios, 10)	11m 33s
build (MatekF405-Wing, chibios, 10)	12m 20s
build (CubeOrange-ODID, chibios, 10)	6m 51s
build (configure-all, chibios, 10)	4m 40s
build (build-options-defaults-test, chibios, 10)	16m 2s
build (signing, chibios, 10)	6m 0s
	1h 49m 24s

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