Better naming of IP address related variables in Beremiz_service.py, Ignore errors that occur on shutdown in Zeroconf.py, fixed discovery dialog crash due to asynchronous call from zeroconf

[TOPOLOGY]
NetName=None
Nodes=0x01
Node64Present=0x01
Node64Name=micromod
Node64DCFName=PEAK MicroMod.eds
EDSBaseName=eds