Add wait_for_commit to /review

Setting wait_for_commit to true permits callers to wait for the index
commit to finish before returning to the client, allowing the client
to immediately run a search and see the modifications match.

Change-Id: I8db6574a340eb76e388c5bb7adc902d81ccb96be

gerrit-sshd/src/main/java/com/google/gerrit/sshd/commands/ReviewCommand.java

@@ -229,6 +229,7 @@ public class ReviewCommand extends SshCommand {
     review.labels = Maps.newTreeMap();
     review.drafts = PostReview.DraftHandling.PUBLISH;
     review.strictLabels = false;
+    review.waitForCommit = true;
     for (ApproveOption ao : optionList) {
       Short v = ao.value();
       if (v != null) {