[FS#595] odhcpd in relay mode floods network with NS packets

[LEDE Bugs]

The following task has a new comment added:

FS#595 - odhcpd in relay mode floods network with NS packets
User who did this - netprince (netprince)

----------
I only had time to test one router on Friday, but yes the flooding problem was gone, and network traffic worked normally.  I can test further on monday.
----------

More information can be found at the following URL:
https://bugs.lede-project.org/index.php?do=details&task_id=595#comment2526