Support MPLSoGRE with the new FIB 2.0

Note that the new way to provision MPLSoGRE is using the "normal"
GRE tunnel such as in the following example:
  create gre tunnel src 10.0.3.1 dst 10.0.3.3
  set in state gre0 up
  set int ip addr gre0 10.0.4.1/30
  set int mpls gre0 enable
  ip route table 4 6.0.0.0/24 via 10.0.4.2 gre0 out-label 30
  mpls local-label add 30 eos ip4-lookup-in-table 4

The previous CLIs/APIs used to configure MPLSoGRE tunnel such as
"create mpls gre tunnel...", "mpls encap|decap add label .." and
"show mpls tunnel", etc. can not be used. They will be deprecated
in a later update to the VPP code base.

Change-Id: I244916841924dc2b87d2143691cd8476716c06b1
Signed-off-by: John Lo <loj@cisco.com>

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