set/unset flavor` unit tests
		
			
			1. We should assert flavor.set_keys() is called correctly
   or not called in ``set flavor`` unit tests.
2. Commit c7e6973ff5 from me
   removed test_flavor_unset_no_project which used to test
   if --project was specified as '', and assert CommandError
   was raised, which is incorrect. So I removed it. But after
   looking into the code, I think we should not remove it,
   but specify nothing after --project, and assert
   ParserException was raised. So in this patch, we fix it
   as so.
   ('--project', '') --> ('--project')
   assert CommandError --> assert ParserException
Change-Id: Ifd33c72d5b7581aaabffb09e9b5e38ecc67e18c0
		
	
OpenStackClient
OpenStackClient (aka OSC) is a command-line client for OpenStack that brings the command set for Compute, Identity, Image, Object Store and Block Storage APIs together in a single shell with a uniform command structure.
The primary goal is to provide a unified shell command structure and a common language to describe operations in OpenStack.
- PyPi - package installation
 - Online Documentation
 - Launchpad project - release management
 - Blueprints - feature specifications
 - Bugs - issue tracking
 - Source
 - Developer - getting started as a developer
 - Contributing - contributing code
 - Testing - testing code
 - IRC: #openstack-sdks on Freenode (irc.freenode.net)
 - License: Apache 2.0
 
Getting Started
OpenStack Client can be installed from PyPI using pip:
pip install python-openstackclient
There are a few variants on getting help. A list of global options
and supported commands is shown with --help:
openstack --help
There is also a help command that can be used to get
help text for a specific command:
openstack help
openstack help server create
Configuration
The CLI is configured via environment variables and command-line options as listed in http://docs.openstack.org/developer/python-openstackclient/authentication.html.
Authentication using username/password is most commonly used:
export OS_AUTH_URL=<url-to-openstack-identity>
export OS_PROJECT_NAME=<project-name>
export OS_USERNAME=<username>
export OS_PASSWORD=<password>  # (optional)
The corresponding command-line options look very similar:
--os-auth-url <url>
--os-project-name <project-name>
--os-username <username>
[--os-password <password>]
If a password is not provided above (in plaintext), you will be interactively prompted to provide one securely.
Authentication may also be performed using an already-acquired token and a URL pointing directly to the service API that presumably was acquired from the Service Catalog:
export OS_TOKEN=<token>
export OS_URL=<url-to-openstack-service>
The corresponding command-line options look very similar:
--os-token <token>
--os-url <url-to-openstack-service>