Making use of the vendor abbreviations created using my previous patch submission 3376779
the attached patch modifies the display of nodes in device.html to provide the option to replace the OUI part of the MAC address with the vendor abbreviation, in much the same way as Wireshark does. The feature can be toggled on and off through "Change View". A browser tooltip will display the full MAC address where required. Default is for the option to be off, but in my environment I'd probably want it on most of the time, so consideration could be given either to defaulting the option on in device.html, or perhaps permitting the administrator to select the default setting via netdisco.conf.
I think this patch is against my branch which includes my previous patch, if my git-foo is right. Or maybe not! (see comments on my git naiivity in previous patch).