Update DHCP_PACKET_MARK schema in state_db

[ghost]

• update DHCP_PACKET_MARK schema in state_db
• this is an update over Add service mark_dhcp_packet to mux container #9015

Example output of DHCP_PACKET_MARK table in state_db:

[prsunny]

Is this a bug from #9015? I think, its a test gap and need some unit-tests

[prsunny]

Please provide proper description following the template

[ghost]

Is this a bug from #9015? I think, its a test gap and need some unit-tests

No bug here, just change the schema.

[ghost]

Please provide proper description following the template

for simple changes, i don't use the template which contains too much unnecessary description.

[qiluo-msft]

This commit could not be cleanly cherry-picked to 202012. Please submit another PR.

[ghost]

This commit could not be cleanly cherry-picked to 202012. Please submit another PR.

I don't see mux docker template file in 202012. Please solve that problem first. "mark_dhcp_packet" is a service inside mux container.

[ghost]

This commit could not be cleanly cherry-picked to 202012. Please submit another PR.

Please check if this pr now can be cherry-picked. If not, I will submit another.