* mavsdk_tests: add multicopter alt hold test
* fix test filter
* increase altitude tolerance to 10m as a test
* reduce to 1m tolerance
* increase to 5m tolerance
* increase to 2m tolerance
* reduce back to 1m
* delay 60 seconds
* fix log upload
* fix ulog upload path
* make altitude tolerance in tester.wait_until_altitude configurable
* fix lambda
* default arg in declaration
* tighten up tolerance