zebra: Cleanup debugs and add a bit more info

zebra: Cleanup debugs and add a bit more info

This commit does 2 things:

1) When receiving a route from the kernel, display the incoming
table as part of the debug, to facilatate knowing what we are
talking about as part of the debug.

2) When displaying nexthop information for routes we were sending
to the kernel, no need to display the route information every time
Display the route then the individual nexthops for what we are doing.

Signed-off-by: Donald Sharp <sharpd@cumulusnetworks.com>