Fix sent for review @ http://review.gluster.org/#change,4668

REVIEW: http://review.gluster.org/4668 (cluster/distribute: Ignore non-participating subvols for layout checks) posted (#5) for review on master by Shishir Gowda (sgowda)

COMMIT: http://review.gluster.org/4668 committed in master by Anand Avati (avati) 
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commit 9c1d7cebbc62723f719b2fd0c45e0a7452e0d6be
Author: shishir gowda <sgowda>
Date:   Thu Apr 4 11:23:08 2013 +0530

    cluster/distribute: Ignore non-participating subvols for layout checks
    
    When subvols-per-directory is < available subvols, then there are layouts
    which are not populated. This leads to incorrect identification of holes or
    overlaps. We need to ignore layouts, which have err == 0, and start == stop.
    In the current scenario (start == stop == 0).
    
    Additionally, in layout-merge, treat missing xattrs as err = 0. In case of
    missing layouts, anomalies will reset them.
    
    For any other valid subvoles, err != 0 in case of layouts being zeroed out.
    
    Also reverted back dht_selfheal_dir_xattr, which does layout calculation only
    on subvols which have errors.
    
    Change-Id: I9f57062722c9e8a26285e10675c31a78921115a1
    BUG: 921408
    Signed-off-by: shishir gowda <sgowda>
    Reviewed-on: http://review.gluster.org/4668
    Tested-by: Gluster Build System <jenkins.com>
    Reviewed-by: Amar Tumballi <amarts>
    Reviewed-by: Jeff Darcy <jdarcy>

REVIEW: http://review.gluster.org/4800 (cluster/distribute: Ignore non-participating subvols for layout checks) posted (#1) for review on release-3.4 by Shishir Gowda (sgowda)

COMMIT: http://review.gluster.org/4800 committed in release-3.4 by Anand Avati (avati) 
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commit 432ce7e60fb58d3cbb019ab3159b7d393afaaed6
Author: Niels de Vos <ndevos>
Date:   Wed Apr 10 17:51:37 2013 +0200

    build: really disable fusermount if you say so
    
    There is no logic in configure.ac that provides a $disable_fusermount
    variable. So, use the $enable_fusermount variable instead.
    
    Follow-up-for: http://review.gluster.org/4773
    Change-Id: I81cdbd0045409d0036438d542ca6dc1934f784e4
    BUG: 948205
    Signed-off-by: Niels de Vos <ndevos>
    Reviewed-on: http://review.gluster.org/4803
    Reviewed-by: Kaleb KEITHLEY <kkeithle>
    Reviewed-by: Sachidananda Urs <sacchi>
    Tested-by: Gluster Build System <jenkins.com>