Revert "To check shared directory is not enough. Shared directory may be...

Revert "To check shared directory is not enough. Shared directory may be created before completing installation. Check signature file too."

This reverts commit ea8ac2d2.

slapos/recipe/cmmi/__init__.py

@@ -285,8 +285,7 @@ class Recipe(object):
         # In shared mode, do nothing if package has been installed.
         if (not self.options['shared'] == ''):
             log.info('Checking whether package is installed at shared path: %s', self.options['shared'])
-            if slapos.recipe.downloadunpacked.test_shared_part(
-              self.options['shared'], '\n'.join(self._debug_signature_text)):
+            if os.path.exists(self.options['shared']):
                 log.info('This shared package has been installed by other package')
                 return parts