Fill in the export_perm and then pass it to get_req_uid_gid

Manage_Gids option works with NFSv3 but fails with NFSv4. We need to
call nfs_export_check_access() first to fill in the export_perm, and
then call get_req_uid_gid().

Signed-off-by: Philippe DENIEL <philippe.deniel@cea.fr>
FSAL_LUSTRE: remove "#include <linux/quota.h>" in exports.c
This header breaks compilation on Lustre 2.4 and 2.5 . It is not needed for compiling 2.1
The important point to remember is that Lustre has its own quota logic which differs from the Linux one : blcoks are larger.

Signed-off-by: Philippe DENIEL <philippe.deniel@cea.fr>