Fix HTTP unit tests

I modified the way errors are returned, and this particular test is
now getting a different access denied response. The new text happens
to be what I intended to have here, so update the test.

Change-Id: I53f8410ca0a52755d80473cd5cbcdb4d8502febf

org.eclipse.jgit.http.test/tst/org/eclipse/jgit/http/test/HttpClientTests.java

@@ -368,8 +368,7 @@ public class HttpClientTests extends HttpTestCase {
 				t.openFetch();
 				fail("connection opened even though service disabled");
 			} catch (TransportException err) {
-				String exp = smartAuthNoneURI
-						+ ": git-upload-pack not permitted";
+				String exp = smartAuthNoneURI + ": Git access forbidden";
 				assertEquals(exp, err.getMessage());
 			}
 		} finally {