features/marker: Check if gsync is enabled in getxattr fop before performing gsync related operations.
features/marker: Check if gsync is enabled in getxattr fop before performing gsync related operations.

Signed-off-by: Junaid <junaid@gluster.com>
Signed-off-by: Vijay Bellur <vijay@gluster.com>

BUG: 2681 (marker returns dummy data for volume-mark attribute if xtime is switched off)
URL: http://bugs.gluster.com/cgi-bin/bugzilla3/show_bug.cgi?id=2681

Kaushikbv/Gluster,Kaushikbv/Gluster,Kaushikbv/Gluster