fix(prov-dev): Fix bug where closing provisioning device client didn'…

…t cleanup all threads

If the provisioning task was interrupted by the user closing the client, it needs to shutdown its executor service that runs the RegisterTask

This fix addresses #1736

provisioning/provisioning-device-client/src/main/java/com/microsoft/azure/sdk/iot/provisioning/device/internal/task/ProvisioningTask.java

@@ -343,7 +343,7 @@ public Object call() throws Exception
             this.executeStateMachineForStatus(registrationOperationStatusParser);
             this.close();
         }
-        catch (ExecutionException | TimeoutException | ProvisioningDeviceClientException | SecurityProviderException e)
+        catch (ExecutionException | TimeoutException | ProvisioningDeviceClientException | SecurityProviderException | InterruptedException e)
         {
             //SRS_ProvisioningTask_25_006: [ This method shall invoke the status callback, if any of the task fail or throw any exception. ]
             this.dpsStatus = PROVISIONING_DEVICE_STATUS_ERROR;