allow more time for mounting nfs volumes
if woody takes time to boot, the nfs volumes may not be mounted on the other servers (this happened after the maintainance shutdown on last friday)
[1521199047] SERVICE ALERT: sid;mount: /data/prod/datastore;CRITICAL;SOFT;1;CRITICAL - not mounted (should be mounted from 'woody.irisa.fr:/data/prod/datastore',nfs4)
[1521199045] SERVICE ALERT: worker0;mount: /data/prod/datastore;CRITICAL;SOFT;1;CRITICAL - not mounted (should be mounted from 'woody.irisa.fr:/data/prod/datastore',nfs4)
[1521199052] SERVICE ALERT: worker1;mount: /data/prod/datastore;CRITICAL;SOFT;1;CRITICAL - not mounted (should be mounted from 'woody.irisa.fr:/data/prod/datastore',nfs4)