Set default for review SSH command to notify=ALL

When the --notify option wasn't given, it defaulted to notify=NONE.
Make it default to notify=ALL.

Bug: issue 2801
Change-Id: I799d3036f93286328311f3339a0e384cc56542c3

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

@@ -200,6 +200,9 @@ public class ReviewCommand extends SshCommand {
     if (changeComment == null) {
       changeComment = "";
     }
+    if (notify == null) {
+      notify = NotifyHandling.ALL;
+    }
 
     ReviewInput review = new ReviewInput();
     review.message = Strings.emptyToNull(changeComment);