Description of problem:
setting xattr on a file while its in progress, once the migration is over all the user set xattrs will be lost

Version-Release number of selected component (if applicable):
3.6.0.28-1.el6rhs.x86_64

How reproducible:
always

Steps to Reproduce:
1.created a 54 brick dist-rep volume
2.created a file GGG of size 3GB
3.rename the file to something else so that triggering rebalance moves this file
4. mv GGG BBB
5. start rebalance force
gluster v start rebalance <vol> force
6. while the migration is in progress set some xattrs using setfattr
7. once the migration is over get the xattr


Actual results:


Expected results:


Additional info:

Before migration
====================
[root@localhost mnt]# setfattr -n trusted.testattr -v "GLUSTER" BBB ; getfattr -n trusted.testattr BBB
# file: BBB
trusted.testattr="GLUSTER"

[root@localhost mnt]# ll
total 3145737
drwxr-xr-x 2 root root        162 Sep 10 15:09 2
-rw-r-Sr-T 1 root root 3221225522 Sep 11 03:06 BBB
-rw-r--r-- 1 root root         24 Sep 10 15:12 f1
-rwxr-xr-x 1 root root       8139 Sep 10 15:11 slow

During migration
=================
[root@localhost mnt]# getfattr -n trusted.testattr BBB
# file: BBB
trusted.testattr="GLUSTER"

after migration
==============
[root@localhost mnt]# getfattr -n trusted.testattr BBB
BBB: trusted.testattr: No such attribute