Add support for bridges with more than one physical link (ie. two bonds each connected to a different switch using MSTP/PVSTP to load balance vlans across links)

Signed-off-by: Pablo Ruiz Garcia <pablo.ruiz@gmail.com>
Handle cases where the vlan bridge has already been setup previouslly.

Signed-off-by: Pablo Ruiz Garcia <pablo.ruiz@gmail.com>
Delayed vlan interface creation until all checks are done.

Signed-off-by: Pablo Ruiz Garcia <pablo.ruiz@gmail.com>
dont use undefined var $ifcount
bump version to 3.0-15