HookMessageTest: Open Transport in try-with-resource

Change-Id: Ie58b01a8a78e4f42a3b913708a545687c5c9f96b
Signed-off-by: David Pursehouse <david.pursehouse@gmail.com>

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

 		final RevCommit Q = src.commit().add("Q", Q_txt).create();
 		final Repository db = src.getRepository();
 		final String dstName = Constants.R_HEADS + "new.branch";
-		Transport t;
 		PushResult result;
 
-		t = Transport.open(db, remoteURI);
-		try {
+		try (Transport t = Transport.open(db, remoteURI)) {
 			final String srcExpr = Q.name();
 			final boolean forceUpdate = false;
 			final String localName = null;
 					srcExpr, dstName, forceUpdate, localName, oldId);
 			result = t.push(NullProgressMonitor.INSTANCE, Collections
 					.singleton(update));
-		} finally {
-			t.close();
 		}
 
 		assertTrue(remoteRepository.hasObject(Q_txt));
 		final RevCommit Q = src.commit().add("Q", Q_txt).create();
 		final Repository db = src.getRepository();
 		final String dstName = Constants.R_HEADS + "new.branch";
-		Transport t;
 		PushResult result;
 
-		t = Transport.open(db, remoteURI);
 		OutputStream out = new ByteArrayOutputStream();
-		try {
+		try (Transport t = Transport.open(db, remoteURI)) {
 			final String srcExpr = Q.name();
 			final boolean forceUpdate = false;
 			final String localName = null;
 					srcExpr, dstName, forceUpdate, localName, oldId);
 			result = t.push(NullProgressMonitor.INSTANCE,
 					Collections.singleton(update), out);
-		} finally {
-			t.close();
 		}
 
 		String expectedMessage = "message line 1\n" //