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Validate input from the NetBIOS table for hostname lookups

This is in reference to case 808512. Currently when NTA wants to find a hostname, it runs an "nbtstat -A" for the IP address of the machine. In some cases the hostname for the device is not the first entry in this table, which causes the hostname to be incorrectly reflected in the NTA database. In the NetBIOS name table there are two "types" of host, GROUP and UNIQUE. NTA should scan this table and only accept names that are UNIQUE. Pictures below of the table, and what NTA looks like when the GROUP is at the top of the table instead of UNIQUE (multiple hosts under one generic name). This seems like an easy way to ensure that the data reflected in NTA is 100% accurate.