OWE: Enable roaming between OWE APs

OWE: Enable roaming between OWE APs

This allows to use the ROAM control interface command to force roaming
on a transition network. Previously, this was not possible, as the open
SSID is stored for the connection profile. Add a new function to also
return OWE transition networks if the profile SSID is set as the
transition-ssid for the OWE RSN network.

Signed-off-by: David Bauer <mail@david-bauer.net>