geoloc: add configuration option to ignore mac addresses

Stephanrequested to merge
se-geoloc-add-ignore-macs into master

config excample:

/etc/config/ddmesh

config geoloc 'geoloc'    
        list ignore_macs '11:22:33:44:55:66 aa:bb:cc:dd:ee:ff'
        list ignore_macs 'a1:22:33:44:55:66 ba:bb:cc:dd:ee:ff'

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