Fix sockaddr_mpls structure.
Now it contains just the label as it must be.

This introduces a ugly hack in rtentry that will be removed
as soon as possible.

OK claudio@

Initial fixup of sockaddr_mpls struct.

Remove smpls_in_iface as labels must be per platform unique.
Remove smpls_out_iface. It is redudant and can be inferred from nexthop.
Move smpls_operation to r

Initial fixup of sockaddr_mpls struct.

Remove smpls_in_iface as labels must be per platform unique.
Remove smpls_out_iface. It is redudant and can be inferred from nexthop.
Move smpls_operation to rt_flags and temporary remove smpls_out_exp.

ok claudio@

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Fix cvs id tag.

Added mpls_output() used to output mpls packets originating from local host.
Strictly similar to mpls_input().

Input and OK claudio@, OK laurent@