cli: fixed a minor log rotate failure msg
cli: fixed a minor log rotate failure msg

Signed-off-by: Amar Tumballi <amar@gluster.com>
Signed-off-by: Vijay Bellur <vijay@dev.gluster.com>

BUG: 1550 (volume log rotate failed.)
URL: http://bugs.gluster.com/cgi-bin/bugzilla3/show_bug.cgi?id=1550

Kaushikbv/Gluster,Kaushikbv/Gluster,Kaushikbv/Gluster