support 403 in get_policy call

[gemal]

the info_cmd code has:

            try:
                policy = s3.get_policy(uri)
                output(u"   policy:    %s" % policy)
            except S3Error as exc:
                # Ignore the exception and don't fail the info
                # if the server doesn't support setting ACLs
                if exc.status not in [404, 501]:
                    raise exc
                output(u"   policy:    none")

if I try to run it on a bucket:

[shell]# s3cmd info s3://xxxx/mysql_backup/day/backup.07.11.2017.tar.gz
s3://xxxx/mysql_backup/day/backup.07.11.2017.tar.gz (object):
   File size: 257583
   Last mod:  Tue, 11 Jul 2017 03:00:05 GMT
   MIME type: application/x-gzip
   Storage:   STANDARD
   MD5 sum:   603ee6e281fca59a77dce1a82abe5e22
   SSE:       none
ERROR: Access to bucket 'xxxx' was denied
ERROR: S3 error: 403 (AccessDenied): Access Denied

perhaps the code should also check for 403 in the ignore?

[fviard]

Fixed in master, thank you for the report!