Plan file structure suggested changes

[ibrasho]

I'd recommend the plan structs to be changed to the following:

type Rule struct {
    RuleSelector RuleSelector `json:"selector,omitempty"`
    RuleAction   RuleAction   `json:"action,omitempty"`
}

type RuleSelector struct {
	// SelectRule does prefix matching on this value
    ClientAddr string  `json:"client_addr,omitempty"`
    Command    string  `json:"command,omitempty"`
    Percentage float64 `json:"percentage,omitempty"`
}

type RuleAction struct {
	Delay       int  `json:"delay,omitempty"`
	Drop        bool `json:"drop,omitempty"`
	ReturnEmpty bool `json:"return_empty,omitempty"`
}

Which would result in the following JSON:

{
    "rules": [
        {
            "selector": {
                "command": "GET",
            },
            "action": {
                "delay": 1000
            },
        },
        {
            "selector": {
                "clientAddr": "159.0.147.225",
                "percentage": 50,
            },
            "action": {
                "drop": true
            },
        },
        {
            "selector": {
                "percentage": 50,
            },
            "action": {
                "returnEmpty": true
            }
        }
    ]
}

Adding support for YAML is recommended too.