Merge r1463750, r1463754, r1464675 from trunk:

Use apr_file_printf(... "%pm"...) instead of explicit call to apr_strerror

Use apr_psprintf(... "%pm"...) instead of explicit call to apr_strerror

Use apr_file_printf(... "%pm"...) instead of explicit call to apr_strerror
+ add some spaces to improve formatting
Submitted by: jailletc36
Reviewed/backported by: jim


git-svn-id: https://svn.apache.org/repos/asf/httpd/httpd/branches/2.4.x@1467978 13f79535-47bb-0310-9956-ffa450edef68