Fix some test cases for expect testing

test/testElseIf.krk

@@ -1,6 +1,4 @@
-import fileio
-
-let x = int(fileio.stdin.readline()[:-1])
+let x = 2
 
 if x == 1:
     print "one"

test/testRuntimeException.krk

@@ -1,7 +1,7 @@
-import system
+import time
 
 try:
-    system.sleep()
+    time.sleep()
 except:
     print "oh no! " + exception
 

test/testTryExcept.krk

@@ -27,4 +27,3 @@ try:
 except:
     print "This is the outer handler."
     print exception
-    raise exception