RepoCommand: Skip RemoteReader when encountering a full SHA-1

There is no point in calling back to the RemoteReader to resolve a
40-digit hex SHA-1 to itself.  We already skip that call when not
ignoring remote failures; skip it when ignoring remote failures, too.

This should simplify RemoteReader implementations.

Reported-by: Han-Wen Nienhuys <hanwen@google.com>
Change-Id: I7566968ed1f39b1ad73574fa903faf3ee308eb87

org.eclipse.jgit/src/org/eclipse/jgit/gitrepo/RepoCommand.java

@@ -534,8 +534,7 @@ public class RepoCommand extends GitCommand<RevCommit> {
 					String path = proj.getPath();
 					String nameUri = proj.getName();
 					ObjectId objectId;
-					if (ObjectId.isId(proj.getRevision())
-							&& !ignoreRemoteFailures) {
+					if (ObjectId.isId(proj.getRevision())) {
 						objectId = ObjectId.fromString(proj.getRevision());
 					} else {
 						objectId = callback.sha1(nameUri, proj.getRevision());