cli to add new networks

[glaslos]

Provide a cli (probably based on Cmd) to add new networks on the fly. Maybe extend to be used to manage the monitored networks.

[glaslos]

Some minor cosmetic and functional changes are still missing.

[pjlantz]

No feature yet to manage monitored networks

[glaslos]

Supported commands proposal:

• create id {} - creates monitor based on json encoded value XYZ (JSON supports proper validation)
• load id file_name - loads the settings file file_name from the settings directory. Settings file should be JSON encoded (right now we are using ConfigObj but I guess JSON is good enough and can be based on the create value)
• status - lists all settings and their monitor status
• stop id - stops the monitor with id 'id'
• restart id - restarts the monitor with id 'id'
• delete id - deletes the setting with the coresbonding id

id is a unique string. I suggest to also create an additional integer id on setting creating.

[glaslos]

Done