Merge r1595426 from trunk:

mod_socache_shmcb: Correct counting of expirations for status display.
Expirations happening during retrieval were not counted.

Submitted by: rjung
Reviewed/backported by: jim


git-svn-id: https://svn.apache.org/repos/asf/httpd/httpd/branches/2.4.x@1595918 13f79535-47bb-0310-9956-ffa450edef68