create userland tests

Fix some more tabs.

Parse the "Simulated exit code not 0!" string in gem5 and exit with the proper status

cli_function.py

@@ -3,6 +3,7 @@
 import argparse
 import imp
 import os
+import sys
 
 class _Argument:
     def __init__(
@@ -193,6 +194,12 @@ class CliFunction:
         args = parser.parse_args(args=cli_args)
         return self(**vars(args))
 
+    def cli_exit(self, *args, **kwargs):
+        '''
+        Same as cli, but also exit the program with int(cli().
+        '''
+        sys.exit(int(self.cli(*args, **kwargs)))
+
     @staticmethod
     def get_key(*args, **kwargs):
         return _Argument.get_key(*args, **kwargs)