VLAN PBIT support for control traffic

[GIC-de]

For control traffic like CFM but also ARP and ICMPv6 it should be possible set PBIT (e.g. 6).

[anzimber]

@GIC-de please also check on setting ip tos values for control traffic for mentioned protocols. thanks

[GIC-de]

This issue has been resolved in BNG Blaster version 0.9.30.