Deprecate Redis Sentinel in 2.6.

Everybody should use the more robust implementation shipped with 2.8.

src/config.c

@@ -417,8 +417,6 @@ void loadServerConfigFromString(char *config) {
                     err = "sentinel directive while not in sentinel mode";
                     goto loaderr;
                 }
-                err = sentinelHandleConfiguration(argv+1,argc-1);
-                if (err) goto loaderr;
             }
         } else {
             err = "Bad directive or wrong number of arguments"; goto loaderr;

src/redis.c

@@ -1110,11 +1110,6 @@ int serverCron(struct aeEventLoop *eventLoop, long long id, void *clientData) {
      * to detect transfer failures. */
     run_with_period(1000) replicationCron();
 
-    /* Run the sentinel timer if we are in sentinel mode. */
-    run_with_period(100) {
-        if (server.sentinel_mode) sentinelTimer();
-    }
-
     server.cronloops++;
     return 1000/server.hz;
 }