Merge r1777556, r1777557, r1777593, r1777594, r1783056 from trunk:

Merge r1777556, r1777557, r1777593, r1777594, r1783056 from trunk:

Use apr_pstrmemdup instead of apr_pstrndup when applicable

Remove a useless break + tiny style fix (missing space)

'repl' is already allocated in the request pool by 'construct_host_header()' the line just before.
So this is safe to use the 'apr_table_setn' variant in order to save a few bytes of memory.

Fix some tiny style issues (missing space)

Save a few bytes in the request pool.
Submitted by: jailletc36
Reviewed by: jailletc36, ylavic, jim

git-svn-id: https://svn.apache.org/repos/asf/httpd/httpd/branches/2.4.x@1789393 13f79535-47bb-0310-9956-ffa450edef68