Send root URI as workspace/configuration scope (#1786)

(cherry picked from commit 2b1bd33)

Author: jakebailey

src/LanguageServer/Impl/LanguageServer.Lifetime.cs

@@ -74,7 +74,10 @@ private async Task<JToken> GetPythonConfigurationAsync(CancellationToken cancell
                     }
                     var args = new ConfigurationParams {
                         items = new[] {
-                            new ConfigurationItem { section = "python" }
+                            new ConfigurationItem {
+                                scopeUri = _initParams.rootUri,
+                                section = "python"
+                            }
                         }
                     };
                     var configs = await _rpc.InvokeWithParameterObjectAsync<JToken>("workspace/configuration", args, cancellationToken);