Merge r1800978 from trunk:

On the trunk:

mod_http2: Simplify ready queue, less memory and better performance. Update
     mod_http2 version to 1.10.7.

Submitted by: icing
Reviewed by: icing, jim, ylavic


git-svn-id: https://svn.apache.org/repos/asf/httpd/httpd/branches/2.4.x@1801045 13f79535-47bb-0310-9956-ffa450edef68