VXDIAG Benz C6 DoIP update to V1.5.5

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VXDIAG Benz C6 DoIP firmware update to v1.5.5. 

V1.5.5 2019-05-29

Add: Benz D-A-S KW2K2N protocol (Read DTC and 7F Negative response)
Fix: Benz D-A-S KL15 ignition signal can not read (no KL15 trig message)