svn merge -c 1177002 from trunk for HADOOP-7687.

git-svn-id: https://svn.apache.org/repos/asf/hadoop/common/branches/branch-0.23-PB@1228683 13f79535-47bb-0310-9956-ffa450edef68

hadoop-common-project/hadoop-common/CHANGES.txt

@@ -8,6 +8,8 @@ Release 0.23-PB - Unreleased
 
     HADOOP-7607. Simplify the RPC proxy cleanup process. (atm)
 
+    HADOOP-7687 Make getProtocolSignature public  (sanjay)
+
 Release 0.23.1 - Unreleased
 
   INCOMPATIBLE CHANGES

hadoop-common-project/hadoop-common/src/main/java/org/apache/hadoop/ipc/ProtocolSignature.java

@@ -199,7 +199,7 @@ public class ProtocolSignature implements Writable {
    * @param protocol protocol
    * @return the server's protocol signature
    */
-  static ProtocolSignature getProtocolSignature(
+  public static ProtocolSignature getProtocolSignature(
       int clientMethodsHashCode,
       long serverVersion,
       Class<? extends VersionedProtocol> protocol) {