scripts: prevent running 'showmount' from the start/post hook script

The 31ganesha-start.sh hook script tries to run 'showmount' to see if
the volume that is getting started should get exported by NFS-Ganesha.
It was reported that this caused the 'gluster volume start ...' command
to hang in case rpcbind is not running.

Instead of running 'showmount', we can use DBus to contact NFS-Ganesha
directly, and request the available exports. This will immediately fail
in case NFS-Ganesha is not running.

Cherry picked from commit 2b2294d2a4ef221fccb6eb9f74e9b7dc233b9f1d:
> BUG: 1294446
> Change-Id: I3aba1f86fead67116ca5adb1864a8be626c334fa
> Reported-by: Jeff Darcy <jdarcy@redhat.com>
> Signed-off-by: Niels de Vos <ndevos@redhat.com>
> Reviewed-on: http://review.gluster.org/13098
> Tested-by: Raghavendra Talur <rtalur@redhat.com>
> Reviewed-by: jiffin tony Thottan <jthottan@redhat.com>
> Reviewed-by: Kaleb KEITHLEY <kkeithle@redhat.com>

BUG: 1297862
Change-Id: I3aba1f86fead67116ca5adb1864a8be626c334fa
Signed-off-by: Niels de Vos <ndevos@redhat.com>
Reviewed-on: http://review.gluster.org/13230
Tested-by: NetBSD Build System <jenkins@build.gluster.org>
Reviewed-by: Kaleb KEITHLEY <kkeithle@redhat.com>

0 files changed, 0 insertions, 0 deletions