support MPLS extension when attach the vrf to the border

[dsx1123]

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Description

New or Affected modules(s):

• dcnm_vrf

DCNM version

• V 12.1.2e

Potential ansible task config

# Copy-paste your ansible playbook
- name: MPLS handoff
  fabric: vxlan_evpn
  config:
  - vrf_name: vrf_blue
    vrf_id: 50002
    attach:
      - ip_address: 172.31.217.101
      - ip_address: 172.31.217.103
      - ip_address: 172.31.186.156
        import_evpn_rt: 50000:1000
        export_evpn_rt: 50000:1000

References

Additional context Add any other context or screenshots about the feature request here. https://www.cisco.com/c/en/us/td/docs/dcn/ndfc/1212/configuration/fabric-controller/cisco-ndfc-fabric-controller-configuration-guide-1212/m-configuring-mpls.html