[common] Create a group of hosts using 2nd element of Module.Path

[uthng]

Attribute Path of each module indicates current module or submodule. It is a list. If there is only element root, it means that terraform has no module or submodule. If the length of Path > 1, it means that Terraform uses module/submodule. Generally, in the case of module, the 2nd element of Path indicates the name of the module declared with instruction:

module "uthng-blog" {
   .....
}

 {
            "path": [
                "root",
                "uthng-blog",
                "scaleway-servers"
            ],
            "outputs": {
                ......
            },
            "resources": {
             ........
           }

The elements at nth position with n >= 2 indicates submodules.