Send no-progress option with NullProgressMonitor.

The NullProgressMonitor does not report progress anywhere. Inform the
server not to send progress by enabling the no-progress capability.

Change-Id: Id18dbc754c814d1a5534a284c947030bf201c569

org.eclipse.jgit/src/org/eclipse/jgit/transport/BasePackFetchConnection.java

@@ -63,6 +63,7 @@ import org.eclipse.jgit.lib.Config;
 import org.eclipse.jgit.lib.Config.SectionParser;
 import org.eclipse.jgit.lib.Constants;
 import org.eclipse.jgit.lib.MutableObjectId;
+import org.eclipse.jgit.lib.NullProgressMonitor;
 import org.eclipse.jgit.lib.ObjectId;
 import org.eclipse.jgit.lib.ObjectInserter;
 import org.eclipse.jgit.lib.ProgressMonitor;
@@ -221,6 +222,8 @@ public abstract class BasePackFetchConnection extends BasePackConnection
 
 	private boolean noDone;
 
+	private boolean noProgress;
+
 	private String lockMessage;
 
 	private PackLock packLock;
@@ -320,7 +323,9 @@ public abstract class BasePackFetchConnection extends BasePackConnection
 	 * Execute common ancestor negotiation and fetch the objects.
 	 *
 	 * @param monitor
-	 *            progress monitor to receive status updates.
+	 *            progress monitor to receive status updates. If the monitor is
+	 *            the {@link NullProgressMonitor#INSTANCE}, then the no-progress
+	 *            option enabled.
 	 * @param want
 	 *            the advertised remote references the caller wants to fetch.
 	 * @param have
@@ -337,6 +342,8 @@ public abstract class BasePackFetchConnection extends BasePackConnection
 			final Collection<Ref> want, final Set<ObjectId> have,
 			OutputStream outputStream) throws TransportException {
 		try {
+			noProgress = monitor == NullProgressMonitor.INSTANCE;
+
 			markRefsAdvertised();
 			markReachable(have, maxTimeWanted(want));
 
@@ -480,6 +487,8 @@ public abstract class BasePackFetchConnection extends BasePackConnection
 
 	private String enableCapabilities() throws TransportException {
 		final StringBuilder line = new StringBuilder();
+		if (noProgress)
+			wantCapability(line, OPTION_NO_PROGRESS);
 		if (includeTags)
 			includeTags = wantCapability(line, OPTION_INCLUDE_TAG);
 		if (allowOfsDelta)