removed request_schema attribute added in previous commits

Author: Vasiliev.A

lib/internal/Magento/Framework/Communication/ConfigInterface.php

@@ -23,7 +23,6 @@ interface ConfigInterface
     const TOPIC_RESPONSE = 'response';
     const TOPIC_IS_SYNCHRONOUS = 'is_synchronous';
     const TOPIC_REQUEST_TYPE = 'request_type';
-    const TOPIC_SERVICE_SCHEMA = 'service_schema';
 
     const TOPIC_REQUEST_TYPE_CLASS = 'object_interface';
     const TOPIC_REQUEST_TYPE_METHOD = 'service_method_interface';

lib/internal/Magento/Framework/Communication/etc/communication.xsd

@@ -38,7 +38,6 @@
         </xs:choice>
         <xs:attribute type="xs:string" name="name" use="required"/>
         <xs:attribute type="schemaType" name="schema" use="optional"/>
-        <xs:attribute type="schemaType" name="service_schema" use="optional"/>
         <xs:attribute type="xs:string" name="request" use="optional"/>
         <xs:attribute type="xs:string" name="response" use="optional"/>
     </xs:complexType>