print MPLS_MCAST as mpls, rather than unknown

The caveat with this is that MPLS and MPLS_MCAST look exactly the
same. I could prefix the MCAST line with "multicast" or something,
but like everything else in MPLS the meaning of that protocol type
is supposed to have changed. It's no longer meant to indicate
multicast mpls, but mpls with a label selected by an upstream. So
what's the right thing to do?

noticed by Mitchell Krome, who used this breakage to identify another
problem, which won't happen anymore.

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