Improve user support
Refs #827
Add flavor create, delete and list actions
flavor create can get multiple values for each of cpu, ram and disk and will create the product of the combinations.
e.g. snf-admin create flavor 8 2048,4096 80,100
Fixes #827
Add user create and user delete commands
user delete is hidden to avoid accidents
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
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