Merge r1491458 from trunk:

mod_cache_socache: Use the name of the socache implementation when performing 
a lookup rather than using the raw arguments.

Submitted by: minfrin
Reviewed/backported by: jim


git-svn-id: https://svn.apache.org/repos/asf/httpd/httpd/branches/2.4.x@1492202 13f79535-47bb-0310-9956-ffa450edef68