features/marker: Filter internal xattrs in lookup

Afr should ignore quota-size-key as part of self-heal
but should heal quota-limit key.

Change-Id: Ic0b06bd20a563a00d6bfdc2dc5a76c661e533ecb
BUG: 1161106
Signed-off-by: Pranith Kumar K <pkarampu@redhat.com>
Reviewed-on: http://review.gluster.org/9061
Tested-by: Gluster Build System <jenkins@build.gluster.com>
Reviewed-by: Raghavendra G <rgowdapp@redhat.com>
Reviewed-by: Vijay Bellur <vbellur@redhat.com>