Merge r1629440, r1629441, r1681424, r1681440, r1681685 from trunk:

Style (mostly indent)
remove a useless local variable initialization

More style

Constify + save a few bytes in conf pool (+ some minor space adjustments)

Save a few bytes in conf pool and axe a function that duplicates 'ap_set_string_slot'

Save a few bytes in conf pool
Submitted by: jailletc36
Reviewed/backported by: jim


git-svn-id: https://svn.apache.org/repos/asf/httpd/httpd/branches/2.4.x@1682889 13f79535-47bb-0310-9956-ffa450edef68