tests: Fixing test for LDP

tests: Fixing test for LDP

LDP now advertises routes it learns over an interface not configured
with LDP.  If the route, which is learned over a non-LDP configured
interface, has no other NHs learned over an interface running LDP,
the router will act as a LDP egress router.

Modifying ldp-topo1/r1/ip_mpls_route.ref to include an extra newline.
Without this newline, the ldp-topo1 was failing.

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