Move gre interface settings to 'interfaces vpp gre'. Create LCP pair kernel interface automatically
set interfaces vpp gre <vppgreN> description <txt> set interfaces vpp gre <vppgreN> disable [valueless] set interfaces vpp gre <vppgreN> remote <ipv4> set interfaces vpp gre <vppgreN> source-address <ipv4> set interfaces vpp gre <vppgreN> tunnel-type <erspan>