Backport of https://bugzilla.redhat.com/show_bug.cgi?id=1364026 fix to 3.8.
REVIEW: http://review.gluster.org/15129 (inode: Adjust lru_size while retiring entries in lru list) posted (#1) for review on release-3.8 by Oleksandr Natalenko (oleksandr)
*** This bug has been marked as a duplicate of bug 1362540 ***