JSch: fix service publication for ServiceLoader

The file name in META-INF/services must be the fully qualified
interface name; the content the fully qualified implementation class
name.

This was broken in commit 9683bc71.

Add a test for the default factory being found by the ServiceLoader.

Change-Id: I1f180d7f60e5c1e74a39bbd9a5f0099bd8343e21
Signed-off-by: Thomas Wolf <thomas.wolf@paranor.ch>

org.eclipse.jgit.ssh.jsch.test/tst/org/eclipse/jgit/transport/ssh/jsch/ServiceLoaderTest.java

@@ -0,0 +1,24 @@
+/*
+ * Copyright (C) 2021, Thomas Wolf <thomas.wolf@paranor.ch> and others
+ *
+ * This program and the accompanying materials are made available under the
+ * terms of the Eclipse Distribution License v. 1.0 which is available at
+ * https://www.eclipse.org/org/documents/edl-v10.php.
+ *
+ * SPDX-License-Identifier: BSD-3-Clause
+ */
+package org.eclipse.jgit.transport.ssh.jsch;
+
+import static org.junit.Assert.assertNotNull;
+
+import org.eclipse.jgit.transport.SshSessionFactory;
+import org.junit.Test;
+
+public class ServiceLoaderTest {
+
+	@Test
+	public void testDefaultFactoryFound() {
+		SshSessionFactory defaultFactory = SshSessionFactory.getInstance();
+		assertNotNull(defaultFactory);
+	}
+}