util: new function virNetDevOpenvswitchInterfaceGetMaster()
This function retrieves the name of the OVS bridge that the given netdev is attached to. This separate function is necessary because OVS set the IFLA_MASTER attribute to "ovs-system" for all netdevs that are attached to an OVS bridge, so the standard method of retrieving the master can't be used. Signed-off-by: NLaine Stump <laine@laine.org> ACKed-by: NMichal Privoznik <mprivozn@redhat.com>
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