Replace usage of String.indexOf with String.contains where possible

Change-Id: Iad3fce891077d85cf2533272c54206c33c37afd8
Signed-off-by: Carsten Hammer <carsten.hammer@t-online.de>
Signed-off-by: David Pursehouse <david.pursehouse@gmail.com>

org.eclipse.jgit.pgm/src/org/eclipse/jgit/pgm/Main.java

@@ -395,7 +395,7 @@ public class Main {
 			}
 
 			final URL u = new URL(
-					(s.indexOf("://") == -1) ? protocol + "://" + s : s); //$NON-NLS-1$ //$NON-NLS-2$
+					(!s.contains("://")) ? protocol + "://" + s : s); //$NON-NLS-1$ //$NON-NLS-2$
 			if (!u.getProtocol().startsWith("http")) //$NON-NLS-1$
 				throw new MalformedURLException(MessageFormat.format(
 						CLIText.get().invalidHttpProxyOnlyHttpSupported, s));

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

@@ -779,7 +779,7 @@ public class TransportHttp extends HttpTransport implements WalkTransport,
 		}
 		// git allows only rewriting the root, i.e., everything before INFO_REFS
 		// or the service name
-		if (next.indexOf(checkFor) < 0) {
+		if (!next.contains(checkFor)) {
 			return false;
 		}
 		// Basically we should test here that whatever follows INFO_REFS is