Fix WWW-Authenticate auth-scheme comparison

The auth-scheme token (like "Basic" or "Digest") is not specified in a
case sensitive way. RFC2617 (http://tools.ietf.org/html/rfc2617) specifies
in section 1.2 the use of a "case-insensitive token to identify the
authentication scheme". Jetty, for example, uses "basic" as token.

Change-Id: I635a94eb0a741abcb3e68195da6913753bdbd889
Signed-off-by: Stefan Lay <stefan.lay@sap.com>

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

@@ -282,7 +282,7 @@ public class HttpClientTests extends HttpTestCase {
 				fail("connection opened even info/refs needs auth basic");
 			} catch (TransportException err) {
 				String exp = dumbAuthBasicURI + ": "
-						+ JGitText.get().authenticationNotSupported;
+						+ JGitText.get().notAuthorized;
 				assertEquals(exp, err.getMessage());
 			}
 		} finally {
@@ -299,7 +299,7 @@ public class HttpClientTests extends HttpTestCase {
 				fail("connection opened even though service disabled");
 			} catch (TransportException err) {
 				String exp = smartAuthBasicURI + ": "
-						+ JGitText.get().authenticationNotSupported;
+						+ JGitText.get().notAuthorized;
 				assertEquals(exp, err.getMessage());
 			}
 		} finally {

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

@@ -85,9 +85,9 @@ abstract class HttpAuthMethod {
 			return NONE;
 
 		String type = hdr.substring(0, sp);
-		if (Basic.NAME.equals(type))
+		if (Basic.NAME.equalsIgnoreCase(type))
 			return new Basic();
-		else if (Digest.NAME.equals(type))
+		else if (Digest.NAME.equalsIgnoreCase(type))
 			return new Digest(hdr.substring(sp + 1));
 		else
 			return NONE;