nfs: make it possible to disable nfs.mount-rmtab

When there are many NFS-clients doing very often mount/unmount actions,
the updating of the 'rmtab' can become a bottleneck and cause delays. In
these situations, the output of 'showmount' may be less important than
the responsiveness of the (un)mounting.

By setting 'nfs.mount-rmtab' to the value "/-", the cache file is not
updated anymore, and the entries are only kept in memory.

Cherry picked from commit 331ef6e1a86bfc0a93f8a9dec6ad35c417873849:
> BUG: 1169317
> Change-Id: I40c4d8d754932f86fb2b1b2588843390464c773d
> Reported-by: Cyril Peponnet <cyril@peponnet.fr>
> Signed-off-by: Niels de Vos <ndevos@redhat.com>
> Reviewed-on: http://review.gluster.org/9223
> Tested-by: Gluster Build System <jenkins@build.gluster.com>
> Reviewed-by: soumya k <skoduri@redhat.com>
> Reviewed-by: jiffin tony Thottan <jthottan@redhat.com>
> Reviewed-by: Kaleb KEITHLEY <kkeithle@redhat.com>

This change also contains the fixes to the test-case from:
>
> nfs: fix spurious failure in bug-1166862.t
>
> In some environments, "showmount" could return an NFS-client that does
> not start with "1". This would cause the test-case to fail. The check is
> incorrect, the number of lines should get counted instead.
>
> Also moving the test-case to the .../nfs/... subdirectory.
>
> Cherry picked from commit ee9b35a780607daddc2832b9af5ed6bf414aebc0:
> BUG: 1166862
> Change-Id: Ic03aa8145ca57d78aea01564466e924b03bb302a
> Signed-off-by: Niels de Vos <ndevos@redhat.com>
> Reviewed-on: http://review.gluster.org/10419
> Tested-by: Gluster Build System <jenkins@build.gluster.com>
> Reviewed-by: Vijay Bellur <vbellur@redhat.com>
>

Change-Id: I40c4d8d754932f86fb2b1b2588843390464c773d
BUG: 1215385
Signed-off-by: Niels de Vos <ndevos@redhat.com>
Reviewed-on: http://review.gluster.org/10379
Tested-by: NetBSD Build System
Tested-by: Gluster Build System <jenkins@build.gluster.com>
Reviewed-by: Vijay Bellur <vbellur@redhat.com>

0 files changed, 0 insertions, 0 deletions