A few non-data commands that should be allowed while loading or stale

SELECT, and HELLO are commands that may be executed by the client
as soon as it connects, there's no reason to block them, preventing the
client from doing the rest of his sequence (which might just be INFO or
CONFIG, etc).

MONITOR, DEBUG, SLOWLOG, TIME, LASTSAVE are all non-data accessing
commands, which there's no reason to block.

Author: oranagra

src/server.c

@@ -579,7 +579,7 @@ struct redisCommand redisCommandTable[] = {
      0,NULL,0,0,0,0,0,0},
 
     {"select",selectCommand,2,
-     "ok-loading fast @keyspace",
+     "ok-loading fast ok-stale @keyspace",
      0,NULL,0,0,0,0,0,0},
 
     {"swapdb",swapdbCommand,3,
@@ -660,7 +660,7 @@ struct redisCommand redisCommandTable[] = {
      0,NULL,0,0,0,0,0,0},
 
     {"lastsave",lastsaveCommand,1,
-     "read-only random fast @admin @dangerous",
+     "read-only random fast ok-loading ok-stale @admin @dangerous",
      0,NULL,0,0,0,0,0,0},
 
     {"type",typeCommand,2,
@@ -708,7 +708,7 @@ struct redisCommand redisCommandTable[] = {
      0,NULL,0,0,0,0,0,0},
 
     {"monitor",monitorCommand,1,
-     "admin no-script",
+     "admin no-script ok-loading ok-stale",
      0,NULL,0,0,0,0,0,0},
 
     {"ttl",ttlCommand,2,
@@ -740,7 +740,7 @@ struct redisCommand redisCommandTable[] = {
      0,NULL,0,0,0,0,0,0},
 
     {"debug",debugCommand,-2,
-     "admin no-script",
+     "admin no-script ok-loading ok-stale",
      0,NULL,0,0,0,0,0,0},
 
     {"config",configCommand,-2,
@@ -820,11 +820,11 @@ struct redisCommand redisCommandTable[] = {
      0,memoryGetKeys,0,0,0,0,0,0},
 
     {"client",clientCommand,-2,
-     "admin no-script random @connection",
+     "admin no-script random ok-loading ok-stale @connection",
      0,NULL,0,0,0,0,0,0},
 
     {"hello",helloCommand,-2,
-     "no-auth no-script fast no-monitor no-slowlog @connection",
+     "no-auth no-script fast no-monitor ok-loading ok-stale no-slowlog @connection",
      0,NULL,0,0,0,0,0,0},
 
     /* EVAL can modify the dataset, however it is not flagged as a write
@@ -838,15 +838,15 @@ struct redisCommand redisCommandTable[] = {
      0,evalGetKeys,0,0,0,0,0,0},
 
     {"slowlog",slowlogCommand,-2,
-     "admin random",
+     "admin random ok-loading ok-stale",
      0,NULL,0,0,0,0,0,0},
 
     {"script",scriptCommand,-2,
      "no-script @scripting",
      0,NULL,0,0,0,0,0,0},
 
     {"time",timeCommand,1,
-     "read-only random fast",
+     "read-only random fast ok-loading ok-stale",
      0,NULL,0,0,0,0,0,0},
 
     {"bitop",bitopCommand,-4,