create userland tests

Fix some more tabs.

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

baremetal/interactive/assert_fail.c

@@ -1,6 +1,6 @@
 #include <common.h>
 
 int main(void) {
-	common_assert_fail();
+    common_assert_fail();
 }
 

baremetal/interactive/exit1.c

@@ -2,5 +2,5 @@
 #include <stdlib.h>
 
 int main(void) {
-	exit(1);
+    exit(1);
 }

baremetal/interactive/hello.c

@@ -1,6 +1,6 @@
 #include <stdio.h>
 
 int main(void) {
-	puts("hello");
-	return 0;
+    puts("hello");
+    return 0;
 }