Description of problem:

Gluster clients using -1 as pid are considered internal to the gluster ecosystem and therefore marker translator should not update xtimes for the changes made by thnm.

Version-Release number of selected component (if applicable):

Seen on master & release-3.2

How reproducible:

Solid.

Steps to Reproduce:
1. rm -rf /backing/dir
2. gluster volume create my-vol my-ip:/backing/dir && gluster volume start my-vol
3. gluster volume set my-vol indexing on
4. glusterfs --client-pid=-1 --volfile-id=my-vol -s localhost /mnt/gluster0/
5. touch /mnt/gluster0/x
6. getfattr -m /backing/dir | grep xtime | wc -l
  
Actual results:

1

Expected results:

0

Additional info: