allocate space for '\0' in string, while adding xlator-option
allocate space for '\0' in string, while adding xlator-option

Signed-off-by: Amar Tumballi <amar@gluster.com>
Signed-off-by: Anand V. Avati <avati@dev.gluster.com>

BUG: 1044 ('--xlator-option' is not working)
URL: http://bugs.gluster.com/cgi-bin/bugzilla3/show_bug.cgi?id=1044

Kaushikbv/Gluster,Kaushikbv/Gluster,Kaushikbv/Gluster