ovs-tcpdump patch

[root@kunpeng82 devuser]# ovs-tcpdump -i patch-ovs-2
Traceback (most recent call last):
  File "/bin/ovs-tcpdump", line 27, in <module>
    import netifaces
ImportError: No module named netifaces
[root@kunpeng82 devuser]# pip install netifaces
bash: pip: command not found
[root@kunpeng82 devuser]# pip3 install netifaces
WARNING: Running pip install with root privileges is generally not a good idea. Try `pip3 install --user` instead.
Collecting netifaces

yum -y install python3-netifaces

ovs-vsctl add-br br1
ovs-vsctl add-br br2

ovs-vsctl add-port br1 tap1 -- set Interface tap1 type=internal
ovs-vsctl add-port br2 tap2 -- set Interface tap2 type=internal

ip netns add ns1
ip netns add ns2

ip link set tap1 netns ns1
ip link set tap2 netns ns2

ip netns exec ns1 ip addr add 1.1.1.1/24 dev tap1
ip netns exec ns1 ip link set tap1 up
ip netns exec ns1 ip link set lo up

ip netns exec ns2 ip addr add 1.1.1.2/24 dev tap2
ip netns exec ns2 ip link set tap2 up
ip netns exec ns2 ip link set lo up

ovs-vsctl add-port br1 patch-ovs-1 -- set Interface patch-ovs-1 type=patch options:peer=patch-ovs-2

ovs-vsctl add-port br2 patch-ovs-2 -- set Interface patch-ovs-2 type=patch options:peer=patch-ovs-1