Restore thread-wait for append
Fix typo (permition --> permission)
Merge branch 'feature-json-output' into develop
Conflicts: Changelog kamaki/cli/commands/image.py
Also, take care of pep8 issues
Fix typo in pithos upload output
Wait threads to finish in pithos append_object
Implement an optional json output 4 outputing cmds
Refs: #3732
Add json/optional output to astakos cmds
Add json/optional responses to flavor/network cmds
Add json/optional outputs to server commands
Do not unpublish by default @ pithos rest calls
Refs: #3780
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