InterfaceManager: Fix stack deconfiguration for vlans

There is a bug in deconfiguration of certain vlan setups (eth-team-vlan).
Since IFLA_MASTER is not used in case of VLANs for parent-slave association
IFLA_LINK has to be used instead to correctly deconfigure the network stack.

Signed-off-by: Jan Tluka <jtluka@redhat.com>
Signed-off-by: Jiri Pirko <jiri@resnulli.us>