Bug 1329895

Description of problem:
------------------------
While optimizing the storage for virt-store, the options available in the file /var/lib/glusterd/groups/virt will applied on the volume.

When running the command "gluster volume set <volname> group virt" it fails with:
volume set: failed: option : eager-lock does not exist
Did you mean eager-lock?

This is because there is now a 'disperse.eager-lock', so it needs to be explicitly named as 'cluster.eager-lock' in the virt group

Version-Release number of selected component (if applicable):
-------------------------------------------------------------
RHGS 3.1.3 nightly ( glusterfs-3.7.9-2.el7rhgs )

How reproducible:
-----------------
Always

Steps to Reproduce:
-------------------
1. Apply the group virt options on the volume
(i.e) gluster volume set <vol> group virt

Actual results:
---------------
Not all the options are set on the volume, and the tagging the volume with group virt results in error

Expected results:
-----------------
All the options in the virt file should be set on the volume successfully

Additional info:
----------------
Changing the line 'eager-lock=enable' to 'cluster.eager-lock=enable' resolves this

Root cause
----------
The cause of this issue is that the options and values listed in the virt profile file doesn't include the domain of the option.

Its always good to have key along with its domain in the format :
"domain.key=value"

The patch - http://review.gluster.org/#/c/13958/ - fixes this issue

The following commit should be backported to RHGS 3.1.3 branch
COMMIT: http://review.gluster.org/13958 committed in release-3.7 by Kaushal M (kaushal) 
------
commit 2b7ae34eff4ed00f15661cf1ca5b2ee07a1d93bd
Author: Vijay Bellur <vbellur>
Date:   Fri Apr 8 21:59:53 2016 -0400

    extras: Add namespace for options in group-virt.example
    
    Commit 23ccabbeb7 introduced a new key "disperse.eager-lock" which
    causes a conflict with key "cluster.eager-lock" when option is used
    without the qualifying namespace. group-virt.example which gets
    installed as /var/lib/glusterd/ groups/virt contains options without
    namespace qualifiers. This patch adds the appropriate namespace to all
    options in group-virt.example.
    
    Change-Id: I2c09dd10d44138410d889ddeb805f01c641c6780
    BUG: 1325630
    Signed-off-by: Vijay Bellur <vbellur>
    Reviewed-on: http://review.gluster.org/13929
    Reviewed-by: Pranith Kumar Karampuri <pkarampu>
    Reviewed-on: http://review.gluster.org/13958
    Smoke: Gluster Build System <jenkins.com>
    Tested-by: Kaushal M <kaushal>
    CentOS-regression: Gluster Build System <jenkins.com>
    NetBSD-regression: NetBSD Build System <jenkins.org>
    Reviewed-by: Kaushal M <kaushal>