rework signal handling #1085

Job	Run time
call-ci / build (armv7a7-imx6ull-evk)	1m 22s
call-ci / build (armv7a9-zynq7000-qemu)	2m 14s
call-ci / build (armv7a9-zynq7000-zedboard)	1m 29s
call-ci / build (armv7a9-zynq7000-zturn)	1m 24s
call-ci / build (armv7m4-stm32l4x6-nucleo)	1m 39s
call-ci / build (armv7m7-imxrt106x-evk)	2m 1s
call-ci / build (armv7m7-imxrt117x-evk)	1m 31s
call-ci / build (host-generic-pc)	1m 1s
call-ci / build (ia32-generic-pc)	1m 20s
call-ci / build (ia32-generic-qemu)	1m 37s
call-ci / build (riscv64-generic-qemu)	1m 16s
call-ci / build (riscv64-generic-spike)	1m 24s
call-ci / run tests on emulators (armv7a9-zynq7000-qemu)	13m 34s
call-ci / run tests on emulators (host-generic-pc)	59s
call-ci / run tests on emulators (ia32-generic-qemu)	13m 28s
call-ci / run tests on hardware (armv7a7-imx6ull-evk)	19s
call-ci / run tests on hardware (armv7m7-imxrt106x-evk)	23s
call-ci / run tests on hardware (armv7m7-imxrt117x-evk)	16s
call-ci / run tests on hardware (armv7a9-zynq7000-zedboard)	12s
call-ci / run tests on hardware (armv7m4-stm32l4x6-nucleo)	12s
call-ci / notify ci team using e-mail	3s
	47m 44s

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