python: mark the tests modules as special when updating the manifest

We manually maintain the tests package's content and dependencies, so mark is as
special (matching create_manifest3.py).

(From OE-Core rev: b4bd4e7e26bb79223129abb9fb6e22e9045e3707)

Signed-off-by: Ross Burton <ross.burton@intel.com>
Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>

meta/recipes-devtools/python/python/create_manifest2.py

@@ -137,7 +137,7 @@ for key in old_manifest:
     # Handle special cases, we assume that when they were manually added 
     # to the manifest we knew what we were doing.
     print ('Handling package %s' % key)
-    special_packages=['misc', 'modules', 'dev']
+    special_packages=['misc', 'modules', 'tests', 'dev']
     if key in special_packages or 'staticdev' in key:
         print('Passing %s package directly' % key)
         new_manifest[key]=old_manifest[key]