Description of problem:
Remove-brick: Directories created after "remove-brick start" should not go to decommissioned bricks 

Version-Release number of selected component (if applicable):
3.4.0.33rhs-1.el6rhs.x86_64

How reproducible:
Always

Steps to Reproduce:
1.created a 5x2 distributed-replicate volume
2. mounted the volume on two different mount points say /mnt1 and /mnt2 
3.ran the following scripts on the mount point

for i in {1..100}; do mkdir $i; cd $i; for j in {1..100}; do dd if=/dev/urandom of=file.$j bs=200k count=1; done; done

4.decommissioned one of the pair

5. while decommissioning is in progress create new directories inside any of the directories created above on both the mount points

6. observe in the backend directories of decommissioning bricks


Actual results:
Newly created directories are getting created on the bricks

Expected results:
New directories should not go into decommissioned bricks

Additional info:
 
Volume Name: dist-rep
Type: Distributed-Replicate
Volume ID: 6b5d55c2-5f0e-4c11-8bc9-d1face6139eb
Status: Started
Number of Bricks: 5 x 2 = 10
Transport-type: tcp
Bricks:
Brick1: 10.70.37.113:/brick1/dr0
Brick2: 10.70.37.134:/brick1/dr0
Brick3: 10.70.37.59:/brick1/dr1
Brick4: 10.70.37.133:/brick1/dr1
Brick5: 10.70.37.113:/brick1/dr2
Brick6: 10.70.37.134:/brick1/dr2
Brick7: 10.70.37.113:/brick1/dr3
Brick8: 10.70.37.134:/brick1/dr3
Brick9: 10.70.37.113:/brick1/dr4 --->decommissioned brick pair
Brick10: 10.70.37.134:/brick1/dr4--->


[root@rhs1-gold 3]# getfattr -d -m . -e hex /brick1/dr4/d2/1/2/3
getfattr: Removing leading '/' from absolute path names
# file: brick1/dr4/d2/1/2/3
trusted.gfid=0x0dd5dbc356e74c72a5088ae61ede69dc
trusted.glusterfs.dht=0x00000001000000000000000000000000

the above directory has got dht layout zeroed out but after starting remove-brick i created the below directories which were created on decommissioned bricks though didn't get the layout.

[root@rhs1-gold 3]# getfattr -d -m . -e hex /brick1/dr4/d2/1/2/3/1
getfattr: Removing leading '/' from absolute path names
# file: brick1/dr4/d2/1/2/3/1
trusted.gfid=0xe81babdeade34eb49dc8727c5b053b0a

[root@rhs1-gold 3]# getfattr -d -m . -e hex /brick1/dr4/d2/1/2/3/1/2
getfattr: Removing leading '/' from absolute path names
# file: brick1/dr4/d2/1/2/3/1/2
trusted.gfid=0x619953752cd8410680ff8000c9415be2