Merge "Don't require heat client for generate_passwords"

tripleo_common/utils/plan.py

@@ -62,11 +62,13 @@ def generate_passwords(swift=None, heat=None,
     - otherwise, all passwords not in the DO_NOT_ROTATE list (as they require
       special handling, like KEKs and Fernet keys) will be replaced.
     """
-    if heat is None:
-        raise RuntimeError('Should provide orchestration client to fetch'
-                           'stack environment')
     if rotate_pw_list is None:
         rotate_pw_list = []
+
+    if heat is None:
+        stack_env = None
+        placement_extracted = False
+    else:
         try:
             stack_env = heat.stacks.environment(
                 stack_id=container)