psh/sysexec: Add option to deamonize a new process #950

Job	Run time
call-ci / build (armv7a7-imx6ull-evk)	1m 8s
call-ci / build (armv7a9-zynq7000-qemu)	1m 36s
call-ci / build (armv7a9-zynq7000-zedboard)	1m 8s
call-ci / build (armv7a9-zynq7000-zturn)	1m 1s
call-ci / build (armv7m4-stm32l4x6-nucleo)	1m 16s
call-ci / build (armv7m7-imxrt105x-evk)	1m 20s
call-ci / build (armv7m7-imxrt106x-evk)	1m 13s
call-ci / build (armv7m7-imxrt117x-evk)	1m 22s
call-ci / build (host-generic-pc)	53s
call-ci / build (ia32-generic-pc)	1m 0s
call-ci / build (ia32-generic-qemu)	59s
call-ci / build (riscv64-generic-qemu)	1m 3s
call-ci / build (riscv64-generic-spike)	59s
call-ci / build (sparcv8leon3-gr716-mini)	56s
call-ci / test EMU (armv7a9-zynq7000-qemu)	9m 11s
call-ci / test EMU (host-generic-pc)	53s
call-ci / test HW (armv7a7-imx6ull-evk)	5m 26s
call-ci / test EMU (ia32-generic-qemu)	6m 23s
call-ci / test HW (armv7m7-imxrt106x-evk)	2m 27s
call-ci / test EMU (riscv64-generic-qemu)	3m 29s
call-ci / test HW (armv7m7-imxrt117x-evk)	2m 46s
call-ci / test HW (armv7a9-zynq7000-zedboard)	7m 27s
call-ci / test HW (armv7m4-stm32l4x6-nucleo)	9m 19s
call-ci / tests-summary	14s
call-ci / send-notification / send-notif	1s
	1h 3m 30s

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