CA-37154: vswitch: Use MAC address of tagged PIF for VLAN fake-bridge

CA-37154: vswitch: Use MAC address of tagged PIF for VLAN fake-bridge

This is because PIF.MAC for a VLAN is FE:FF:FF:FF:FF:FF. In bridge
mode the VLAN and the bridge naturally pick up the underlying MAC
address from the physical device but under vswitch we must explicitly
specify it and we are currently specifying
FE:FF:FF:FF:FF. interface-reconfigure needs to use the MAC address of
the tagged PIF not the untagged PIF.

Signed-off-by: Ian Campbell <ian.campbell@citrix.com>
# HG changeset patch
# User Ian Campbell <ian.campbell@citrix.com>
# Date 1265020755 0
# Node ID d7fc59d6a274334377fdbb09dcaf80a76431bcdb
# Parent  a6f27b5a3096ce627b5003c7be19ca59f7dd9606