[Cli] Adding more options to `azk info`

azukiapp / azk

azk is a lightweight open source development environment orchestration tool. Instantly & safely run any environment on your local machine.

http://azk.io

Apache License 2.0

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Closed nuxlli closed 8 years ago

nuxlli commented 8 years ago

This PR adds the following options to the command azk info:

[<system>]: just like in the commands azk start and azk stop, now it's possible to specify a system or a list of systems to retrieve info from;
--json: the command output is formatted as a JSON;
--filter=[properties]: a list of system properties to be shown (the default behavior is to show all of them);