Config: activerehashing option support in CONFIG SET.

src/config.c

@@ -737,6 +737,11 @@ void configSetCommand(redisClient *c) {
 
         if (yn == -1) goto badfmt;
         server.repl_slave_ro = yn;
+    } else if (!strcasecmp(c->argv[2]->ptr,"activerehashing")) {
+        int yn = yesnotoi(o->ptr);
+
+        if (yn == -1) goto badfmt;
+        server.activerehashing = yn;
     } else if (!strcasecmp(c->argv[2]->ptr,"dir")) {
         if (chdir((char*)o->ptr) == -1) {
             addReplyErrorFormat(c,"Changing directory: %s", strerror(errno));