Do not inform other virtual interfaces of scan results in all cases

Do not inform other virtual interfaces of scan results in all cases

If a connection operation is started on an interface based on scan
results, other virtual interfaces should not be information about the
results to avoid potential concurrent operations during the association
steps. Since the sibling notification of scan results received was added
as an optimization, skipping it for this type of cases is the simplest
way of avoiding unnecessary concurrent operations.

Change-Id: I145b4237074a97cc75fd68933fff7ed99b850630
Signed-off-by: Dmitry Shmidt <dimitrysh@google.com>