feature/quota: Logging corrections

This patch solves the inconsistent quota usage logging when soft limit reached.

Change-Id: I47e7f1e65ed4b8306a999a20cc8f6b1772d47627
BUG: 1087198
Signed-off-by: Varun Shastry <vshastry@redhat.com>
Reviewed-on: http://review.gluster.org/7451
Tested-by: Gluster Build System <jenkins@build.gluster.com>
Reviewed-by: Vijay Bellur <vbellur@redhat.com>