rgw/rados: remove confused error printout

[Yan-waller]

Maybe we should not print or log this failed message when
the pool_iterate returns -ENOENT which means no objects but failed.

this message will be print on the screen in the hammer version.

Signed-off-by: Yan Jun yan.jun8@zte.com.cn

[xiexingguo]

Then we might want to cast answer to 0 if pool_iterate returns -ENOENT, too.

[robbat2]

I'd maybe log ENOENT at a higher level. It's been useful to me in the past.

[xiexingguo]

retest this please

[Yan-waller]

I mean that we will get the following errors, while there are no bucket or user at all in the hammer version, and the message will be logged as an error in later version.

[root@yanun ceph]# radosgw-admin metadata list bucket
[
]
2016-06-01 00:18:30.779689 7f31d711b880 -1 failed to list objects pool_iterate returned r=-2
[root@yanun ceph]# 
[root@yanun ceph]# radosgw-admin metadata list user
ERROR: lists_keys_next(): (2) No such file or directory
2016-06-01 00:27:38.486869 7fecd1390880 -1 failed to list objects pool_iterate returned r=-2
[root@yanun ceph]#

[Yan-waller]

retest this please

[Yan-waller]

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