Made it so that the config uses a shared cache (which is shared with the password gen).

Adjusted some naming to have slightly shorter variable names (pw_gen).
Removed need for section in password generator.
Adjusted passing of the renamed variable around and the other places pw_gen should be used.

Added helper class that can be used by both pw_gen and cfg to get ids and adjusted print out of the config to
now just print out the shared cache, which seems to make sense to me.

devstack/opts.py

@@ -53,7 +53,8 @@ def parse():
         action="store_true",
         dest="dryrun",
         default=False,
-        help="perform actions without actually doing any of them and/or attempt to do this: (default: %default)")
+        help=("perform ACTION but do not actually run any of the commands"
+              " that would normally complete ACTION: (default: %default)"))
 
     base_group = OptionGroup(parser, "Install & uninstall & start & stop specific options")
     base_group.add_option("-a", "--action",