replace Userid with Authid

in most generic places. this is accompanied by a change in
RpcEnvironment to purposefully break existing call sites.

Signed-off-by: Fabian Grünbichler <f.gruenbichler@proxmox.com>

src/config/remote.rs

@@ -45,7 +45,7 @@ pub const REMOTE_PASSWORD_SCHEMA: Schema = StringSchema::new("Password or auth t
             type: u16,
         },
         userid: {
-            type: Userid,
+            type: Authid,
         },
         password: {
             schema: REMOTE_PASSWORD_SCHEMA,