feat(lib): Init netconf-junos

The code is copied from netconf-module, `with lib;` have been replaced
by inherits

lib/netconf-junos/poe.nix

@@ -0,0 +1,49 @@
+{ config, lib, ... }:
+
+let
+  inherit (lib)
+    mapAttrsToList
+    mkEnableOption
+    mkOption
+    optionalString
+    ;
+
+  inherit (lib.types) attrsOf str submodule;
+
+  interface-module =
+    { name, config, ... }:
+    {
+      options = {
+        enable = mkEnableOption "the PoE for this interface";
+        xml = mkOption {
+          type = str;
+          visible = false;
+          readOnly = true;
+        };
+      };
+      config.xml = ''
+        <interface><name>${name}</name>${optionalString (!config.enable) "<disable/>"}</interface>
+      '';
+    };
+in
+{
+  options = {
+    poe.interfaces = mkOption {
+      type = attrsOf (submodule interface-module);
+      default = { };
+      description = ''
+        PoE configuration of interfaces.
+      '';
+    };
+    netconf.xmls.poe = mkOption {
+      type = str;
+      visible = false;
+      readOnly = true;
+    };
+  };
+  config.netconf.xmls.poe = ''
+    <poe operation="replace">
+      ${builtins.concatStringsSep "" (mapAttrsToList (_: intf: intf.xml) config.poe.interfaces)}
+    </poe>
+  '';
+}