Fix backtick evaluation bug in cache-size
Fix backtick evaluation bug in cache-size

Signed-off-by: Harshavardhana <harsha@gluster.com>
Signed-off-by: Anand V. Avati <avati@dev.gluster.com>

BUG: 768 (cache-size might be wrong in glusterfs.vol)
URL: http://bugs.gluster.com/cgi-bin/bugzilla3/show_bug.cgi?id=768

Kaushikbv/Gluster,Kaushikbv/Gluster,Kaushikbv/Gluster