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labs nfs scratch and dumps to soft mode

Authored by cpettet <rush@wikimedia.org> on May 20 2016, 7:18 PM.

Description

labs nfs scratch and dumps to soft mode

Some options cannot be activated on a remount which
Puppet is not savvy too. So first run w/ this change
results in a failure for '/bin/mount -o remount /path'
per mount. This is transient and will not affect
subsequent runs. The correct options are then staged
in /etc/fstab for umount/mount or reboot.

timeout is duration until failure 1/10ths of a sec
retrans is how many timeouts to sustain

Bug: T126083
Change-Id: I1e9049bc390b0e1eafa486e83a58d0cf6654ff57