Remove unnecessary suppression of deprecation warnings in tests

Change-Id: I722f8c2e80129e0129349b55a53b29626e2af21c
Signed-off-by: David Pursehouse <david.pursehouse@sonymobile.com>

org.eclipse.jgit.test/tst/org/eclipse/jgit/internal/storage/file/T0003_BasicTest.java

@@ -84,7 +84,6 @@ import org.eclipse.jgit.test.resources.SampleDataRepositoryTestCase;
 import org.eclipse.jgit.util.FileUtils;
 import org.junit.Test;
 
-@SuppressWarnings("deprecation")
 public class T0003_BasicTest extends SampleDataRepositoryTestCase {
 
 	@Test

org.eclipse.jgit.test/tst/org/eclipse/jgit/lib/IndexDiffTest.java

@@ -77,7 +77,6 @@ import org.eclipse.jgit.treewalk.FileTreeIterator;
 import org.eclipse.jgit.util.IO;
 import org.junit.Test;
 
-@SuppressWarnings("deprecation")
 public class IndexDiffTest extends RepositoryTestCase {
 
 	static PathEdit add(final Repository db, final File workdir,

org.eclipse.jgit.test/tst/org/eclipse/jgit/revwalk/ObjectWalkTest.java

@@ -53,7 +53,6 @@ import org.eclipse.jgit.lib.ObjectInserter;
 import org.eclipse.jgit.lib.TreeFormatter;
 import org.junit.Test;
 
-@SuppressWarnings("deprecation")
 public class ObjectWalkTest extends RevWalkTestCase {
 	protected ObjectWalk objw;