Merge branch 'develop_beta' of github.com:openmessaging/openmessaging-java into develop

Rename status code and add some comment for Future class.

Author: duhengforever

openmessaging-api/src/main/java/io/openmessaging/Message.java

@@ -174,7 +174,7 @@ interface Headers {
         /**
          * The {@code messagekey} header field contains the custom key of a message.
          * <p>
-         * This key is a customer identifier for a class of messages, and this key may be used for server to shard or
+         * This key is a customer identifier for a class of messages, and this key may be used for server to hash or
          * dispatch messages, or even can use this key to implement order message.
          * <p>
          */
@@ -346,15 +346,15 @@ interface Headers {
     KeyValue properties();
 
     /**
-     * Get message body
+     * Get data from message body
      *
      * @return message body
      * @throws OMSMessageFormatException if the message body cannot be assigned to the specified type
      */
     byte[] getData();
 
     /**
-     * Set message body
+     * Set data to message body
      *
      * @param data set message body in binary stream
      */

openmessaging-api/src/main/java/io/openmessaging/OMSBuiltinKeys.java

@@ -45,11 +45,4 @@ public interface OMSBuiltinKeys {
      * The {@code REGION} key shows the specified region in OMS driver schema.
      */
     String REGION = "REGION";
-
-    /**
-     * The {@code OPERATION_TIMEOUT} key defines the timeout of almost all the method calls in OMS.
-     */
-    String OPERATION_TIMEOUT = "OPERATION_TIMEOUT";
-
-
 }