VLAN trunking and QinQ support for Linux Bridges

[rsmontero]

Description
This issue it to implement VLAN trunking support in Linux bridging. As the implementation of QinQ uses this bridge functionality we will implement support for it in this issue.

Use case
This will allow to restrict the VLANs that a VM can access to and use trunking mode in a secure way, as we'll as easily define QinQ networks.

Interface Changes
The implementation should use the attributes already present in OpenvSwitch

• VLAN trunking, uses VLAN_TAGGED_ID to specify a range of VLANs to tag, for example: 1,10,30,32,100-200.
• QinQ uses 2 different attributes to set the customer and service vlan ids:
  • CVLANS Customer VLAN IDs, as a comma separated list
  • VLAN_ID Service 802.1Q VLAN ID. (current setting)

Additional Context
A different feature will address access control to the VLAN sets

Progress Status

• Code committed
• Testing - QA
• Documentation (Release notes - resolved issues, compatibility, known issues)