xserver-nodm-init: redirect Xserver output to log file

Xserver prints many debug messages by the console output,
this bbappend modifies the init line to redirect the messages
to a log file.

Signed-off-by: Arturo Buzarra <arturo.buzarra@digi.com>

meta-digi-dey/recipes-graphics/x11-common/xserver-nodm-init_%.bbappend

@@ -0,0 +1,6 @@
+# Copyright (C) 2018 Digi International
+
+do_install_append() {
+    # Redirect output to log file
+    sed -i -e "/^exec/{s,\$\*,\$\* >/var/log/Xsession.log 2>\&1,}" ${D}${sysconfdir}/xserver-nodm/Xserver
+}