error out if the data-self-heal-window-size is less than 1
error out if the data-self-heal-window-size is less than 1

Signed-off-by: Raghavendra Bhat <raghavendrabhat@gluster.com>
Signed-off-by: Anand V. Avati <avati@dev.gluster.com>

BUG: 2120 ()
URL: http://bugs.gluster.com/cgi-bin/bugzilla3/show_bug.cgi?id=2120

Kaushikbv/Gluster,Kaushikbv/Gluster,Kaushikbv/Gluster