ldpd: fixing host-only configuration filter.

ldpd: fixing host-only configuration filter.

There is configuration in LDP to only create labels for
host-routes.   If the user remove this configuration the code
was not readvertising non-host routes to it's LDP neighbors.
The issue is the same in reverse also.  If the user adds this
configuration on an active LDP session the non-host routes were
not withdrawn.

Signed-off-by: Lynne Morrison <lynne@voltanet.io>