Some unit tests fail

[Bengt-M]

I can see that some is because of the added tri mixer, but maybe not all.

config_unittest
Failed test:
ConfigUnittest.TestResetConfigZeroValues

flight_mixer_unittest
undefined reference to triInitMixer undefined reference totriEnableServoUnarmed
undefined reference to triServoMixer undefined reference totriGetMotorCorrection

pid_unittest
Failed tests:
PIDUnittest.TestPidLuxFloat
PIDUnittest.TestPidLuxFloatIntegrationForLinearFunction
PIDUnittest.TestPidLuxFloatIntegrationForQuadraticFunction
PIDUnittest.TestPidMultiWiiRewriteITermConstrain

rx_ranges_unittest
unit/rc_controls_unittest.cc:240:5: warning: missing initializer for member 'controlRateConfig_s::tpa_breakpoint' [-Wmissing-field-initializers]
unit/rc_controls_unittest.cc:240:5: warning: missing initializer for member 'controlRateConfig_s::tpa_yaw_breakpoint' [-Wmissing-field-initializers]
unit/rc_controls_unittest.cc:313:5: warning: missing initializer for member 'controlRateConfig_s::tpa_breakpoint' [-Wmissing-field-initializers]
unit/rc_controls_unittest.cc:313:5: warning: missing initializer for member 'controlRateConfig_s::tpa_yaw_breakpoint' [-Wmissing-field-initializers]