mod_proxy_cluster should display the full version string of httpd it was built with

This is a suggestion to display:

[Tue Oct 25 12:48:18 2016] [notice] Apache/2.2.15 (Unix) DAV/2 mod_cluster/1.2.13.Final_httpd-2.2.15-39.el6.x86_64 configured -- resuming normal operations

instead of the current version string

[Mon Oct 31 06:31:31 2016] [notice] Apache/2.2.15 (Unix) DAV/2 mod_cluster/1.2.13.Final configured -- resuming normal operations

The motivation is to clearly state with which httpd it is safe to to run mod_proxy_cluster modules so as to avoid mysterious SegFaults caused by "I took these mod_proxy_cluster modules build with httpd x and run them with httpd y and it all seemed to be good up until...".

I'm not absolutely sure this is the right place to do so though. I'd like to hear from rhn-engineering-rhusar and rhn-engineering-jclere to either upvote this enhancement or to downvote it into oblivion.