Symptom:
Problem Description:
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While deploying MPLS SR with "use virual interface" option PE Vlan id is made
as a mandatory attribute, which is not required.

If this value is provided this will create a sub-interface which will result in deploy failure.

Problem Detail:
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Steps To Re-create:
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1) Create MPLS policy with "Use Virtual Interface" option enabled
2) Attempt to deploy MPLS SR using the above policy choosing BVI interface and notice vlan id is a mandatory attribute. 
This will create interface BVI with a subinterface
3) Deploy will fails with error "specified interface type does not support VRFs'"

Conditions:
Issue noticed when deploying MPLS SR with virtual interface in XR device.