HONEYCOMB-118: extend classifer model to support node names.
* configuration write is supported (updates local cache
with relative node mapping)
* operational read is supported only for nodes with existing
relative node mapping
* ACL support (using vpp-classfier or ietf-acl model)
is not affected by the patch (tables/sessions for access controll
refer to neighbour nodes as packet-handling-action, not vpp-node-name)
Change-Id: Ice0c846803cc7e8960c3571fd2a13ed46ba53702
Signed-off-by: Marek Gradzki <mgradzki@cisco.com>