Put back type_hints for python after 3.7

Author: CJCombrink

test/py/RunClientServer.py

@@ -285,9 +285,8 @@ def main():
 
     generated_dirs = []
     for gp_dir in options.genpydirs.split(','):
-        if gp_dir == 'type_hints':
-            # Skip type hints tests -> See THRIFT-5885 (it might be related)
-            print('Skipping \'type_hints\' tests')
+        if gp_dir == 'type_hints' and (sys.version_info < (3,7)):
+            print('Skipping \'type_hints\' test since python 3.7 or later is required')
             continue
         generated_dirs.append('gen-py-%s' % (gp_dir))