#14490, #14491: add 'sundry'-style import tests for Tools/scripts.

This patch changes a few of the scripts to have __name__=='__main__'
clauses so that they are importable without running.  Also fixes the
syntax errors revealed by the tests.
diff --git a/Tools/scripts/find_recursionlimit.py b/Tools/scripts/find_recursionlimit.py
index 443f052..7a86603 100755
--- a/Tools/scripts/find_recursionlimit.py
+++ b/Tools/scripts/find_recursionlimit.py
@@ -106,14 +106,16 @@
     else:
         print("Yikes!")
 
-limit = 1000
-while 1:
-    check_limit(limit, "test_recurse")
-    check_limit(limit, "test_add")
-    check_limit(limit, "test_repr")
-    check_limit(limit, "test_init")
-    check_limit(limit, "test_getattr")
-    check_limit(limit, "test_getitem")
-    check_limit(limit, "test_cpickle")
-    print("Limit of %d is fine" % limit)
-    limit = limit + 100
+if __name__ == '__main__':
+
+    limit = 1000
+    while 1:
+        check_limit(limit, "test_recurse")
+        check_limit(limit, "test_add")
+        check_limit(limit, "test_repr")
+        check_limit(limit, "test_init")
+        check_limit(limit, "test_getattr")
+        check_limit(limit, "test_getitem")
+        check_limit(limit, "test_cpickle")
+        print("Limit of %d is fine" % limit)
+        limit = limit + 100