Fix a doctest failure. Since shared part is read-only, it is necessary to...

Fix a doctest failure. Since shared part is read-only, it is necessary to change permission before removing.

slapos/recipe/cmmi/README.txt

@@ -1012,7 +1012,7 @@ Install shared package
 
 Use option ``shared`` to install a shared pacakge.
     >>> import os
-    >>> _ = system('rm -rf %s' % join(os.path.dirname(__file__), 'shared'))
+    >>> _ = system('chmod -R u+w %(path)s && rm -rf %(path)s' % dict(path=join(os.path.dirname(__file__), 'shared')))
     >>> shared_dir = join(os.path.dirname(__file__), 'shared')
     >>> os.mkdir(shared_dir)