Clarify description of ServiceNotAuthorizedException

This exception's detail message states

	Service not permitted

and according to the Javadoc it indicates that the current user does not
have access to the service.  In practice, though, callers handle this
exception by presenting a '401 Unauthorized' response to the client,
meaning that the user is unauthenticated and should authenticate.

Clarify the documentation and detail message to match the practice.

The exception message is not used anywhere except logs.  No
client-visible effect intended.

Change-Id: I2c6be9cb74af932f0dcb121a381a64f2ad876766
Signed-off-by: Jonathan Nieder <jrn@google.com>

org.eclipse.jgit/resources/org/eclipse/jgit/internal/JGitText.properties

 sequenceTooLargeForDiffAlgorithm=Sequence too large for difference algorithm.
 serviceNotEnabledNoName=Service not enabled
 serviceNotPermitted={0} not permitted
-serviceNotPermittedNoName=Service not permitted
 shallowCommitsAlreadyInitialized=Shallow commits have already been initialized
 shortCompressedStreamAt=Short compressed stream at {0}
 shortReadOfBlock=Short read of block.
 unableToCreateNewObject=Unable to create new object: {0}
 unableToStore=Unable to store {0}.
 unableToWrite=Unable to write {0}
+unauthorized=Unauthorized
 unencodeableFile=Unencodable file: {0}
 unexpectedCompareResult=Unexpected metadata comparison result: {0}
 unexpectedEndOfConfigFile=Unexpected end of config file

org.eclipse.jgit/src/org/eclipse/jgit/internal/JGitText.java

 	/***/ public String sequenceTooLargeForDiffAlgorithm;
 	/***/ public String serviceNotEnabledNoName;
 	/***/ public String serviceNotPermitted;
-	/***/ public String serviceNotPermittedNoName;
 	/***/ public String shallowCommitsAlreadyInitialized;
 	/***/ public String shortCompressedStreamAt;
 	/***/ public String shortReadOfBlock;
 	/***/ public String unableToCreateNewObject;
 	/***/ public String unableToStore;
 	/***/ public String unableToWrite;
+	/***/ public String unauthorized;
 	/***/ public String unencodeableFile;
 	/***/ public String unexpectedCompareResult;
 	/***/ public String unexpectedEndOfConfigFile;

org.eclipse.jgit/src/org/eclipse/jgit/transport/resolver/ServiceNotAuthorizedException.java

 
 import org.eclipse.jgit.internal.JGitText;
 
-/** Indicates the request service is not authorized for current user. */
+/**
+ * Indicates that the requested service requires authentication that
+ * the current user has not provided.
+ * <p>
+ * This corresponds to response code
+ * {@link javax.servlet.http.HttpServletResponse#SC_UNAUTHORIZED}.
+ */
 public class ServiceNotAuthorizedException extends Exception {
 	private static final long serialVersionUID = 1L;
 
-	/** Indicates the request service is not available. */
 	public ServiceNotAuthorizedException() {
-		super(JGitText.get().serviceNotPermittedNoName);
+		super(JGitText.get().unauthorized);
 	}
 }