feat(http): update query data version

[hycdong]

#706 update replica query data version http interface. The pervious interface is like below:

{
    "1":{
        "data_version": "1",
        "pidx" : "1",
    },
    ......
}

This pull request simplify this interface, remove the duplicated pidx filed, like below:

{
    "1":{
        "data_version": "1",
    },
    ......
}