GitConstructionTest: Open Git instance in try-with-resource

Change-Id: Iddf658acd1c78161d6028cfcfb7e5c73534ae40b
Signed-off-by: David Pursehouse <david.pursehouse@sonymobile.com>

org.eclipse.jgit.test/tst/org/eclipse/jgit/api/GitConstructionTest.java

@@ -66,11 +66,12 @@ public class GitConstructionTest extends RepositoryTestCase {
 	@Before
 	public void setUp() throws Exception {
 		super.setUp();
-		Git git = new Git(db);
+		try (Git git = new Git(db)) {
 			git.commit().setMessage("initial commit").call();
 			writeTrashFile("Test.txt", "Hello world");
 			git.add().addFilepattern("Test.txt").call();
 			git.commit().setMessage("Initial commit").call();
+		}
 
 		bareRepo = Git.cloneRepository().setBare(true)
 				.setURI(db.getDirectory().toURI().toString())