When the network connectivity is bad, routers may not appear in the
translation tables, or there may be no originator with TQ >0. Such
conditions to not warrant spamming the log with error messages.
This package drops all incoming router advertisements except for the
default router with the best metric according to B.A.T.M.A.N. advanced.
Note that advertisements originating from the node itself (for example
via gluon-radvd) are not affected.
