HttpBlobStore add hostname and port to SSL Connection constructor

this change adds host and port parameters to SSL connection contrcutor
with out which the blobstore download client cannot talk to endpoints
sharing SSL certificates.

Fixes bazelbuild#6551

src/main/java/com/google/devtools/build/lib/remote/blobstore/http/HttpBlobStore.java

@@ -187,7 +187,8 @@ private HttpBlobStore(
     } else {
       sslCtx = null;
     }
-
+    final int port = uri.getPort();
+    final String hostname = uri.getHost();
     this.eventLoop = newEventLoopGroup.apply(2);
     Bootstrap clientBootstrap =
         new Bootstrap()
@@ -208,7 +209,7 @@ public void channelAcquired(Channel ch) {}
           public void channelCreated(Channel ch) {
             ChannelPipeline p = ch.pipeline();
             if (sslCtx != null) {
-              SSLEngine engine = sslCtx.newEngine(ch.alloc());
+              SSLEngine engine = sslCtx.newEngine(ch.alloc(), hostname, port);
               engine.setUseClientMode(true);
               p.addFirst("ssl-handler", new SslHandler(engine));
             }