Better way to handle relative URLs in manifest XML

The old implementation will NOT strip the filename part from the baseUrl, e.g.
https://android.googlesource.com/platform/manifest with .. will be resolved to
https://android.googlesource.com/platform/, which is actually wrong. This
implementation will resolve it to https://android.googlesource.com/ to match the
behavior of repo.

Change-Id: Ia32c8b34e16eacdf37a0da7025bf0b5cc5f67ed2
Signed-off-by: Yuxuan 'fishy' Wang <fishywang@google.com>

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

@@ -351,8 +351,8 @@ public class RepoCommand extends GitCommand<RevCommit> {
 			}
 			final String remoteUrl;
 			try {
-				URI uri = new URI(String.format("%s/%s/", baseUrl, remotes.get(defaultRemote))); //$NON-NLS-1$
+				URI uri = new URI(baseUrl);
-				remoteUrl = uri.normalize().toString();
+				remoteUrl = uri.resolve(remotes.get(defaultRemote)).toString();
 			} catch (URISyntaxException e) {
 				throw new SAXException(e);
 			}