lib, sharpd, zebra: Add new enum for lsp type and pass it through.

lib, sharpd, zebra: Add new enum for lsp type and pass it through.

Add the ability to pass the lsp owner type through the zapi
and in addition add a new label type for the sharp protocol
for testing.

Finally modify zebra_mpls.h to not have defaults specified
for the enum.  That way when we add a new LSP type the
compile fails and the person doing the addition knows
where he has to touch shit.

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