Add option to show soft-deleted stacks in stack-list

A new boolean stack-list option, "--show-deleted", will cause
soft-deleted stacks to be included in the stack-list output.

Example:
  heat stack-list --show-deleted

Change-Id: I8ad6b4b477448000688bf83afe6b41ebf29656a4
blueprint: stack-list-soft-deleted
Don't allow "propagate" of heatclient logger

Unlike other project, if we specified "--debug" in heatclient, it will
display duplicate debug info. This is because the "propagate" of
heatclient logger is True as default.

Change-Id: Ia15878690e5ff0f29f7a11c044a66677af2909ee
Closes-Bug: #1320789
Merge "Add option to show soft-deleted stacks in stack-list"
Merge "Don't allow "propagate" of heatclient logger"