Add user create and user delete commands
user delete is hidden to avoid accidents
Refs #827
Add user modify command
Code refactoring
Make clear that commands can have arguments
Add support for ImageMetadata
Refs #727
Initial import of snf-admin command line tool
Update API to return 4 kinds of graphs
Also temporarily disable encryption of backend id.
Refs #527
Add a Get Server Stats API method
Show firewall profile if present
Add initial support for firewall profiles
Refs #659
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