Add tag in compute interfaces schema for microversion 2.70

https://docs.openstack.org/api-ref/compute/#list-port-interfaces
Optional field 'tag' is added in the response body of the following APIs
in compute microversion 2.70:
   - GET /servers/{server_id}/os-interface
   - POST /servers/{server_id}/os-interface
   - GET /servers/{server_id}/os-interface/{port_id}

This is to add it in the interface schema of compute microversion 2.70.

Implements: blueprint fix-microversion-gap

Change-Id: I6d5c27cadf75919a54e20eb2b095dec22817e47a
3 files changed