Merge r1719018, r1719189, r1719190 from trunk:

Use 'apr_pstrmemdup' instead of 'apr_pstrndup' when applicable in order to save a few cycles.

Use 'apr_pstrmemdup' instead of 'apr_pstrndup' when applicable in order to save a few cycles.

Fix some minor style issue.
Submitted by: jailletc36
Reviewed/backported by: jim


git-svn-id: https://svn.apache.org/repos/asf/httpd/httpd/branches/2.4.x@1725506 13f79535-47bb-0310-9956-ffa450edef68