Rework the DHCP analyzer to make it compatible again.
Merge branch 'master' into topic/vladg/dhcp
DHCP:

 - Added the known-devices log, and the script to log DHCP hostname per MAC address,
 - Added DPD sig,
 - Removed some scripts following a discussion with Seth.
DHCP: Adding unit tests.
Merge remote-tracking branch 'origin/topic/vladg/dhcp'

* origin/topic/vladg/dhcp:
  DHCP: Adding unit tests.
  DHCP:
  Rework the DHCP analyzer to make it compatible again.
Merge branch 'master' into topic/robin/dhcp-merge
Updating tests for DHCP.