lib, zebra: dup addr detect display detection fields

lib, zebra: dup addr detect display detection fields

Display following Per MAC and Neigh's output:
If duplicate address detection is under process,
display detection start time and detection count.
If duplicate address detection detected an address
as duplicate, display detection time and duplicate
status.

Signed-off-by: Chirag Shah <chirag@cumulusnetworks.com>