Revert "openvpn service: source up/down scripts"

This reverts commit 50ad243f78.

nixos/modules/services/networking/openvpn.nix

@@ -28,10 +28,9 @@ let
           fi
         done
 
+        ${cfg.up}
         ${optionalString cfg.updateResolvConf
            "${pkgs.update-resolv-conf}/libexec/openvpn/update-resolv-conf"}
-
-        ${optionalString (cfg.up != "") "source ${userSuppliedUpScript}"}
       '';
 
       downScript = ''
@@ -39,15 +38,6 @@ let
         export PATH=${path}
         ${optionalString cfg.updateResolvConf
            "${pkgs.update-resolv-conf}/libexec/openvpn/update-resolv-conf"}
-
-        ${optionalString (cfg.down != "") "source ${userSuppliedDownScript}"}
-      '';
-
-      userSuppliedUpScript = pkgs.writeScript "openvpn-${name}-userSuppliedUpScript" ''
-        ${cfg.up}
-      '';
-
-      userSuppliedDownScript = pkgs.writeScript "openvpn-${name}-userSuppliedDownScript" ''
         ${cfg.down}
       '';
 
@@ -143,7 +133,7 @@ in
             default = "";
             type = types.lines;
             description = ''
-              Shell script sourced by NixOS generated script when the instance is starting.
+              Shell commands executed when the instance is starting.
             '';
           };
 
@@ -151,7 +141,7 @@ in
             default = "";
             type = types.lines;
             description = ''
-              Shell script sourced by NixOS generated script when the instance is shutting down.
+              Shell commands executed when the instance is shutting down.
             '';
           };