RevertCommand: Add "." after reverted commit id

This makes the message look the same as in C Git (the "."):

  This reverts commit <sha1>.

Change-Id: I4c254c122277b127e7b039c0d1c7f7a0d691530d
Signed-off-by: Robin Stocker <robin@nibor.org>

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

@@ -55,7 +55,7 @@ import org.eclipse.jgit.revwalk.RevCommit;
 import org.junit.Test;
 
 /**
- * Test cherry-pick command
+ * Test revert command
  */
 public class RevertCommandTest extends RepositoryTestCase {
 	@Test
@@ -90,7 +90,10 @@ public class RevertCommandTest extends RepositoryTestCase {
 		checkFile(new File(db.getWorkTree(), "a"),
 				"first line\nsec. line\nthird line\nfourth line\n");
 		Iterator<RevCommit> history = git.log().call().iterator();
-		assertEquals("Revert \"fixed a\"", history.next().getShortMessage());
+		RevCommit revertCommit = history.next();
+		String expectedMessage = "Revert \"fixed a\"\n\n"
+				+ "This reverts commit " + fixingA.getId().getName() + ".\n";
+		assertEquals(expectedMessage, revertCommit.getFullMessage());
 		assertEquals("fixed b", history.next().getFullMessage());
 		assertEquals("fixed a", history.next().getFullMessage());
 		assertEquals("enlarged a", history.next().getFullMessage());

org.eclipse.jgit/src/org/eclipse/jgit/api/RevertCommand.java

@@ -149,7 +149,7 @@ public class RevertCommand extends GitCommand<RevCommit> {
 					String newMessage = "Revert \""
 							+ srcCommit.getShortMessage() + "\"" + "\n\n"
 							+ "This reverts commit "
-							+ srcCommit.getId().getName() + "\n";
+							+ srcCommit.getId().getName() + ".\n";
 					newHead = new Git(getRepository()).commit().setMessage(
 							newMessage).call();
 					revertedRefs.add(src);