Update submodule ecl to latest Wed Nov 20 00:38:06 UTC 2019

    - ecl in PX4/Firmware (03f20c2): PX4/PX4-ECL@d76b704
    - ecl current upstream: PX4/PX4-ECL@811ec81
    - Changes: PX4/PX4-ECL@d76b704...811ec81

    811ec81 2019-11-11 bresch - parameters: change check_mag_strength from bool to int32_t to comply with the standard interface
c7bdf25 2019-11-08 Mathieu Bresciani - [ekf] controlMagFusion refactor and mag field strength check (#662)
a684065 2019-10-24 bresch - ekf: Extract resetState from main reset and reinitialize the covariances in the init function
bf48004 2019-10-21 bresch - ekf: move "reset" part of the init function into a separate function add getter for the vehicle at rest flag
7eb9118 2019-11-03 TSC21 - Jenkins: update container tags; use px4-dev-base-bionic