AP_Networking: add timeout to swap the UDP Server client target #111

Job	Run time
build (stm32f7, chibios, 10)	14m 50s
build (stm32h7, chibios, 10)	13m 24s
build (fmuv2-plane, chibios, 10)	6m 13s
build (periph-build, chibios, 10)	14m 36s
build (iofirmware, chibios, 10)	2m 46s
build (CubeOrange-bootloader, chibios, 10)	1m 30s
build (fmuv3-bootloader, chibios, 10)	1m 27s
build (revo-bootloader, chibios, 10)	1m 13s
build (stm32h7-debug, chibios, 10)	7m 19s
build (fmuv3, chibios, 10)	14m 20s
build (revo-mini, chibios, 10)	11m 5s
build (MatekF405-Wing, chibios, 10)	11m 26s
build (CubeOrange-ODID, chibios, 10)	8m 50s
build (CubeRedPrimary-bootloader, chibios, 10)	1m 5s
build (configure-all, chibios, 10)	10m 9s
build (build-options-defaults-test, chibios, 10)	27m 54s
build (signing, chibios, 10)	9m 58s
build (CubeOrange-PPP, chibios, 10)	6m 59s
build (SOHW, chibios, 10)	13m 18s
build (Pixhawk6X-PPPGW, chibios, 10)	3m 16s
build (new-check, chibios, 10)	14m 14s
	3h 15m 52s

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