Add debug-shell to the debug module

Signed-off-by: Thiago Abdo <tja14@inf.ufpr.br>

remote/modules/debug/data/etc/systemd/system/debug-shell.service

+#  This file is part of systemd.
+#
+#  systemd is free software; you can redistribute it and/or modify it
+#  under the terms of the GNU Lesser General Public License as published by
+#  the Free Software Foundation; either version 2.1 of the License, or
+#  (at your option) any later version.
+
+[Unit]
+Description=Early root shell on /dev/tty9 FOR DEBUGGING ONLY
+Documentation=man:sushell(8)
+DefaultDependencies=no
+IgnoreOnIsolate=yes
+
+[Service]
+Environment=TERM=linux
+ExecStart=/bin/ash
+Restart=always
+RestartSec=0
+StandardInput=tty
+TTYPath=/dev/tty3
+TTYReset=yes
+TTYVHangup=yes
+KillMode=process
+IgnoreSIGPIPE=no
+# bash ignores SIGTERM
+KillSignal=SIGHUP
+
+# Unset locale for the console getty since the console has problems
+# displaying some internationalized messages.
+Environment=LANG= LANGUAGE= LC_CTYPE= LC_NUMERIC= LC_TIME= LC_COLLATE= LC_MONETARY= LC_MESSAGES= LC_PAPER= LC_NAME= LC_ADDRESS= LC_TELEPHONE= LC_MEASUREMENT= LC_IDENTIFICATION=
+
+[Install]
+WantedBy=sysinit.target

remote/modules/debug/data/etc/systemd/system/sysinit.target.wants/debug-shell.service

+../debug-shell.service
\ No newline at end of file