sbus: use 120 second default timeout
    
    As discussed in #1654537, first login to a system as a FreeIPA
    domain user now usually causes an expensive SELinux operation
    to happen; this can take longer than the default bus message
    timeout of 25 seconds. To deal with this for now, let's use a
    120 second default timeout; this is a big hammer, but unless we
    can refactor things to use a longer timeout just for that one
    call, or make the actual operation take less time, there's not
    much else we can do.
    
    Resolves:
    https://bugzilla.redhat.com/show_bug.cgi?id=1654537
    
    Resolves:
    https://pagure.io/SSSD/sssd/issue/3909
    
    Signed-off-by: Adam Williamson <awilliam@redhat.com>
    
    Reviewed-by: Pavel Březina <pbrezina@redhat.com>