Add a test command support for Bonito3aserver

Original code has no test command support in PMON command line, it caused the problem as Bug 353
described as http://www.loongson.cn/dev/bugzilla/show_bug.cgi?id=353 showes. Now the command
is added for Bonito3aserver.

Targets: Bonito3aserver

Targets/Bonito3aserver/conf/Bonito.3aserver

@@ -106,6 +106,8 @@ select		cmd_devls		# Device list
 select		cmd_set			# As cmd_env but not req. cmd_hist
 select		cmd_testdisk
 #
+
+select          cmd_test                # test commands,test hardisk
 select		cmd_shell		# Shell commands, vers, help, eval