tests: don't use unix socket path that matches auto-generated path
    
    The test was introduced by 60135b22db6d.
    
    The auto-generated path is removed by post-parse callback which
    also changes the mode from "connect" to "bind" since the auto-generated
    path makes sense only for "bind" mode.
    
    Signed-off-by: Pavel Hrdina <phrdina@redhat.com>