CheckoutCommand: fix reflog message

There is a space missing between <from> and "to" in the reflog
message produced by the CheckoutCommand, which is of the form

moving from <from> to <to>

Change-Id: I3dc57ab0a6589292db77a17d9029ee9499dfc725
Signed-off-by: Mathias Kinzler <mathias.kinzler@sap.com>

org.eclipse.jgit/src/org/eclipse/jgit/api/CheckoutCommand.java

@@ -147,7 +147,7 @@ public class CheckoutCommand extends GitCommand<Ref> {
 				ref = null;
 			RefUpdate refUpdate = repo.updateRef(Constants.HEAD, ref == null);
 			refUpdate.setForceUpdate(force);
-			refUpdate.setRefLogMessage(refLogMessage + "to "
+			refUpdate.setRefLogMessage(refLogMessage + " to "
 					+ newCommit.getName(), false);
 			Result updateResult;
 			if (ref != null)