cluster/afr: Removed misleading log from afr_start_crawl

Problem: If it is fresh volume with no files created the xattrop directory is
         not present. If crawl happens in that time, lookup for xattrop
         directory will fail and it results in  printing a misleading log.

Fix:     Changed misleading log.

Change-Id: Iae5da3e8423564d64096f88abdaf8c98e4935840
BUG: 928575
Signed-off-by: Venkatesh Somyajulu <vsomyaju@redhat.com>
Reviewed-on: http://review.gluster.org/4993
Reviewed-by: Vijay Bellur <vbellur@redhat.com>
Tested-by: Gluster Build System <jenkins@build.gluster.com>