Change the string used to test for serial console (#1054951)
    
    The string used to test for serial console is a literal ("ttyS").  To support
    serial consoles other than those starting with "ttyS", such as ttyAMA0 for ARM,
    create a list of string values that may be used.  Add a property to test if
    the console device starts with any of these strings.
    
    Note: 64-bit ARM (aarch64) hardware may use either ttyS0 or ttyAMA0 for the
    serial console.  The Foundation Model simulator currently uses ttyAMA0.
    
    Resolves: rhbz#1054951
    
    Signed-off-by: David A. Marlin <dmarlin@redhat.com>
    Signed-off-by: Vratislav Podzimek <vpodzime@redhat.com>