New Auto_reboot plug-in II

Also, added code to obmc boot test to process rest_username and
rest_password.

Change-Id: I7b64be7072d4848230e9d47a4da54ac89794af64
diff --git a/bin/plug_ins/Auto_reboot/parm_def b/bin/plug_ins/Auto_reboot/parm_def
new file mode 100755
index 0000000..748be18
--- /dev/null
+++ b/bin/plug_ins/Auto_reboot/parm_def
@@ -0,0 +1,2 @@
+# Indicates whether auto_boot should be disabled.
+disable=boolean