Merge UDT and NPM LLDP pollers

Problem:

     Both UDT and NPM appear to polling devices for the LLDP entries.

     One gets stored in UDT_lldpentries the other in NPMLLDPentries.

     The structure of the tables is identical between the two.

     UDT has no SWIS interface to adjust polling

Idea:

Drop the poller from UDT:

     UDT to use NPMLLDPentries for the LLDP data

     UDT to make use of SWIS to add the NPM poller for LLDP data if it needs it.