[Client] Deduplicate error log for SSLException (apache#3320)

### Motivation

While testing apache#3310, I noticed that the `PerChannelBookieClient#exceptionCaught` logic contains redundant logs when the exception is an `SSLException`. This PR removes a redundant log from client.

Based on reading through the rest of the method, this should be a trivial change with no other side effects. My one question is how closing a channel and closing the context differ. Technically, returning early skips the `ctx.close()`, which could change the behavior.

### Changes

* Return early to prevent a redundant log

(cherry picked from commit bd82797)
(cherry picked from commit e3091df)

bookkeeper-server/src/main/java/org/apache/bookkeeper/proto/PerChannelBookieClient.java

@@ -1289,6 +1289,7 @@ public void exceptionCaught(ChannelHandlerContext ctx, Throwable cause) throws E
             if (c != null) {
                 closeChannel(c);
             }
+            return;
         }
 
         if (cause instanceof IOException) {