NSH metadata data not written in the packet

pop_nsh is being done before copying NSH fields, should be done after

cookie=0xba5eba1100000203, duration=4921.547s, table=87, n_packets=16, n_bytes=1792, priority=650,nsi=254,nsp=58 actions=pop_nsh,move:NXM_NX_NSH_C1[]>NXM_NX_TUN_IPV4_DST[],move:NXM_NX_NSH_C2[]>NXM_NX_TUN_ID[0..31],output:2