sshd: use PropertyResolver in test

Improve the SshTestGitServer API for accessing the server properties.
Instead of returning the raw property map, return the proper sshd API
abstraction PropertyResolver.

This makes the interface more resilient against upstream changes.

Change-Id: Ie5b685bddc4e59f3eb6c121026d3658d57618ca4
Signed-off-by: Thomas Wolf <thomas.wolf@paranor.ch>

org.eclipse.jgit.junit.ssh/src/org/eclipse/jgit/junit/ssh/SshTestGitServer.java

@@ -22,9 +22,9 @@ import java.util.ArrayList;
 import java.util.Collections;
 import java.util.List;
 import java.util.Locale;
-import java.util.Map;
 
 import org.apache.sshd.common.NamedResource;
+import org.apache.sshd.common.PropertyResolver;
 import org.apache.sshd.common.PropertyResolverUtils;
 import org.apache.sshd.common.SshConstants;
 import org.apache.sshd.common.config.keys.AuthorizedKeyEntry;
@@ -349,14 +349,14 @@ public class SshTestGitServer {
 	}
 
 	/**
-	 * Retrieves the server's property map. This is a live map; changing it
-	 * affects the server.
+	 * Retrieves the server's {@link PropertyResolver}, giving access to server
+	 * properties.
 	 *
-	 * @return a live map of the server's properties
+	 * @return the {@link PropertyResolver}
 	 * @since 5.9
 	 */
-	public Map<String, Object> getProperties() {
-		return server.getProperties();
+	public PropertyResolver getPropertyResolver() {
+		return server;
 	}
 
 	/**

org.eclipse.jgit.ssh.apache.test/tst/org/eclipse/jgit/transport/sshd/ApacheSshTest.java

@@ -21,6 +21,7 @@ import java.util.Arrays;
 import java.util.List;
 import java.util.stream.Collectors;
 import org.apache.sshd.client.config.hosts.KnownHostEntry;
+import org.apache.sshd.common.PropertyResolverUtils;
 import org.apache.sshd.server.ServerFactoryManager;
 import org.eclipse.jgit.api.Git;
 import org.eclipse.jgit.api.errors.TransportException;
@@ -189,8 +190,8 @@ public class ApacheSshTest extends SshTestBase {
 	 */
 	@Test
 	public void testCloneAndFetchWithSessionLimit() throws Exception {
-		server.getProperties().put(ServerFactoryManager.MAX_CONCURRENT_SESSIONS,
-				Integer.valueOf(2));
+		PropertyResolverUtils.updateProperty(server.getPropertyResolver(),
+				ServerFactoryManager.MAX_CONCURRENT_SESSIONS, 2);
 		File localClone = cloneWith("ssh://localhost/doesntmatter",
 				defaultCloneDir, null, //
 				"Host localhost", //