Log merge errors (at level DEBUG).

Change-Id: If1c43a2965c30e56b09a6cf85bcf8959c67d62c6
Reviewed-on: https://review.openstack.org/15927
Reviewed-by: Clark Boylan <clark.boylan@gmail.com>
Approved: James E. Blair <corvus@inaugust.com>
Tested-by: Jenkins
1 file changed