Verified on Satellite 6.3, qpid-cpp-server-1.36.0-9.el7 using the reproducer from the original report. 

On a Satellite client the following loop was running:

while true; 
do 
  subscription-manager register --org="Default_Organization" --username=admin --password=nimda 
  sleep 5
  systemctl restart goferd
  sleep 5
  subscription-manager unregister
done

Monitoring the /var/lib/qpidd/.qpidd/qls/p001/efp/2048k/in_use dir on the Sat 6.3 server using following commands:

ls in_use | wc -l
du -ks in_use

The directory wasn't completely stable, but the number of files and present and consumed disk space always went down after a short (and not too high) spike, so qpid server was cleaning up old files and not leaving orphans. 

VERIFIED

Since the problem described in this bug report should be
resolved in a recent advisory, it has been closed with a
resolution of ERRATA.

For information on the advisory, and where to find the updated
files, follow the link below.

If the solution does not work for you, open a new bug report.

https://access.redhat.com/errata/RHBA-2018:0338