Removed placeholder tests.

Evidently this way of nagging myself to write tests doesn't work.

bramble-core/src/test/java/org/briarproject/bramble/properties/TransportPropertyManagerImplTest.java

-package org.briarproject.bramble.properties;
-
-import org.briarproject.bramble.test.BrambleTestCase;
-import org.junit.Test;
-
-import static org.junit.Assert.fail;
-
-public class TransportPropertyManagerImplTest extends BrambleTestCase {
-
-	@Test
-	public void testUnitTestsExist() {
-		fail(); // FIXME: Write tests
-	}
-}

briar-core/src/test/java/org/briarproject/briar/forum/ForumManagerImplTest.java

-package org.briarproject.briar.forum;
-
-import org.briarproject.briar.test.BriarTestCase;
-import org.junit.Test;
-
-import static org.junit.Assert.fail;
-
-public class ForumManagerImplTest extends BriarTestCase {
-
-	@Test
-	public void testUnitTestsExist() {
-		fail(); // FIXME: Write tests
-	}
-}

briar-core/src/test/java/org/briarproject/briar/messaging/MessagingManagerImplTest.java

-package org.briarproject.briar.messaging;
-
-import org.briarproject.briar.test.BriarTestCase;
-import org.junit.Test;
-
-import static org.junit.Assert.fail;
-
-public class MessagingManagerImplTest extends BriarTestCase {
-
-	@Test
-	public void testUnitTestsExist() {
-		fail(); // FIXME: Write tests
-	}
-}

briar-core/src/test/java/org/briarproject/briar/sharing/SharingManagerImplTest.java

-package org.briarproject.briar.sharing;
-
-import org.briarproject.briar.test.BriarTestCase;
-import org.junit.Test;
-
-import static org.junit.Assert.fail;
-
-public class SharingManagerImplTest extends BriarTestCase {
-
-	@Test
-	public void testUnitTestsExist() {
-		fail(); // FIXME: Write tests
-	}
-}