tests: added "tests file2" filesystem test

this is useful for testing for filesystem corruption on cluster
boundaries
FMUv2: switch debug console and 2nd GPS

this allows a normal GPS cable to be used for the 2nd GPS, making
dual-GPS setups easier
Fixed warning
Merge branch 'master' of github.com:PX4/Firmware
Revert "Fixed warning"

This reverts commit 3639c7ae91f5226b71cdba8d8cc98eae4bba7e07.
Merge remote-tracking branch 'upstream/master' into fw_trim
fw pitch sp and roll sp offset parameter