nsh encap(nsh) encap(ethernet) outter mac is all zero does not match talbe 10

[Wei Hui]

networking-sfc stein
[root@compute1 openvswitch-2.11.0]# uname -a
Linux compute1 3.10.0-693.el7.x86_64 #1 SMP Tue Aug 22 21:09:27 UTC 2017 x86_64 x86_64 x86_64 GNU/Linux
openvswitch 2.11.0

http://man7.org/linux/man-pages/man7/ovs-actions.7.html
The encap(ethernet) variant encapsulate a bare L3 packet in an
       Ethernet frame. The Ethernet type is initialized to the L3 packet’s
       type, e.g. 0x0800 if the L3 packet is IPv4. The Ethernet source and
       destination are initially zeroed.

 cookie=0x3a35346be9d7bfe8, duration=289.975s, table=5, n_packets=559, n_bytes=54782, priority=0,ip,dl_dst=fa:16:3e:28:ca:68 actions=encap(nsh),set_field:0x2->nsh_spi,set_field:255->nsh_si,encap(ethernet),push_vlan:0x8100,set_field:4114->vlan_vid,resubmit(,10)

cookie=0x3a35346be9d7bfe8, duration=278.043s, table=10, n_packets=141, n_bytes=13818, priority=1,dl_vlan=18,dl_dst=fa:16:3e:28:ca:68 actions=pop_vlan,decap(),decap(),output:"qvoa72eb67c-36"

[Wei Hui (huiweics)]

also add flow to table 10 report error

openvswitch-agent.log:5718:2019-12-24 15:24:17.148 3652358 ERROR neutron.agent.common.ovs_lib [req-62f90557-d9f9-4a94-a081-db4cc021738c - - - - -] Unable to execute ['ovs-ofctl', 'add-flows', '-O', 'OpenFlow13', 'br-int', '-']. Exception: Exit code: 1; Stdin: hard_timeout=0,idle_timeout=0,priority=1,cookie=2103133625977426012,nsh_spi=2,nsh_mdtype=1,eth_type=35151,table=10,dl_dst=fa:16:3e:28:ca:68,dl_vlan=18,nsh_si=255,actions=strip_vlan,move:NXM_OF_ETH_DST->OXM_OF_PKT_REG0[0..47],decap(),decap(),move:OXM_OF_PKT_REG0[0..47]->NXM_OF_ETH_DST,output:226; Stdout: ; Stderr: 2019-12-24T07:24:17Z|00001|meta_flow|WARN|destination field eth_dst lacks correct prerequisites

[OpenStack Infra (hudson-openstack)]

Change abandoned by "Rodolfo Alonso <email address hidden>" on branch: master
Review: https://review.opendev.org/c/openstack/networking-sfc/+/700800
Reason: If needed, feel free to restore the patch