[g5k-postinstall] upgrade to NFSv4
- remove intr (deprecated and ignored since 2.6.25)
- remove rsize/wsize => autonegotiate between client/server
Prochaines maintenances programmées: lundi 06/05, lundi 03/06, lundi 01/07
Pour plus d'informations: https://doc-si.inria.fr/display/SU/Gitlab