mavsdk_server: default to the first autopilot #3446

Job	Run time
coverage (ubuntu-20.04)	5m 59s
alpine 3.11.6 (musl)	1h 16m 57s
ubuntu-18.04 (package, non-mavsdk_server)	5m 25s
Ubuntu/Debian packaging (Ubuntu 20.04)	11m 38s
android-arm	16m 30s
linux-armv6	5m 1s
android-arm64	18m 9s
linux-armv7	6m 17s
ubuntu-20.04 (package, non-mavsdk_server)	5m 19s
linux-armv6-musl	32m 19s
android-x86	14m 59s
linux-arm64	5m 14s
android-x86_64	15m 23s
linux-armv7l-musl	29m 53s
linux-arm64-musl	36m 1s
manylinux2010-x64	25m 46s
ios	29m 47s
macOS	1h 17m 7s
ios_simulator	28m 59s
fedora-34 (package, non-mavsdk_server)	7m 50s
macOS-framework	1h 11m 55s
ubuntu-20.04 (check style and docs)	6m 4s
fedora-35 (package, non-mavsdk_server)	6m 9s
ubuntu-20.04 (mavsdk, hunter)	7m 58s
ubuntu-20.04 (non-mavsdk_server, non-superbuild)	4m 44s
ubuntu-20.04 (proto check)	16m 36s
ubuntu-20.04 (mavsdk_server, superbuild)	1h 9m 8s
Windows	59m 8s
iOS XCFramework	1s
	11h 36m 16s

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