Bug#36977174 remove unused headers in classic_greeting_receiver.cc

classic_greeting_receiver.cc includes

  "sql/server_component/mysql_command_services_imp.h"

which isn't used.

Change
======

- removed unused header

Change-Id: Ie06e8b2a67f14e63f3274f16f0031f13a13da1bc

Author: weigon

router/src/routing/src/classic_greeting_receiver.cc

@@ -55,7 +55,6 @@
 #include "mysqlrouter/connection_base.h"
 #include "processor.h"
 #include "router_config.h"  // MYSQL_ROUTER_VERSION
-#include "sql/server_component/mysql_command_services_imp.h"
 #include "tracer.h"
 
 IMPORT_LOG_FUNCTIONS()