Support vlan action, including pop and push

[shuowang-123]

This would allow users to strip/add vlan tags as a packet goes through an interface. Tested on an Oracle Linux 8 VM. I ran the test without clean up, and verified that vlan push rule was added correctly:

filter parent ffff: protocol all pref 1 flower chain 0
filter parent ffff: protocol all pref 1 flower chain 0 handle 0x1
eth_type ipv4
dst_ip 1.0.0.1/24
src_ip 2.0.0.1/24
enc_dst_ip 3.0.0.1/24
enc_src_ip 4.0.0.1/24
enc_key_id 1234
enc_dst_port 8472
not_in_hw
action order 1: vlan pop pipe
index 1 ref 1 bind 1

action order 2: vlan  push id 1234 protocol 802.1Q priority 0 pipe
 index 2 ref 1 bind 1

action order 3: mirred (Egress Redirect to device bar) stolen
index 1 ref 1 bind 1

[shuowang-123]

This should fix #588

[aboch]

@shuowang-123 please fix the conflicts

[aboch]

@shuowang-123 please fix the conflicts

[aboch]

@shuowang-123 ping