Updated openstack/openstack
Project: openstack/python-heatclient  aa30e4642a5e71b6149dfc29821d4d85da410cc9
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Enable --help for each command

Now heat stack-create --help outputs same with heat --help. It should
output the help message for stack-create instead of the global one.

Change-Id: I1b451ddb4ecba3bb3294ff3219a5ecad394ada9e