commit edcb6426f20c3be5dd5f50b76a686754aef2f64e
 Author: Alan Coopersmith <alan.coopersmith@oracle.com>
 Date:   Fri Jan 1 18:11:14 2016 -0800

    Use unique logfile names when starting server with -displayfd

    Fixes https://bugs.freedesktop.org/show_bug.cgi?id=93212

    Previously all X servers started with -displayfd would overwrite
    Xorg.0.log - now a temporary name of Xorg.pid-<pid>.log is used
    until after -displayfd finds an open display - then it is renamed
    to the traditional Xorg.<display>.log name.
Reviewed-by: Adam Jackson <ajax@redhat.com>
Signed-off-by: Alan Coopersmith <alan.coopersmith@oracle.com>
Backported-to-NX-by: Mike Gabriel <mike.gabriel@das-netzwerkteam.de>