Merge r1451633, r1451905, r1451921, r1452259, r1453981, r1501913, r1513508, r1531340...

Merge r1451633, r1451905, r1451921, r1452259, r1453981, r1501913, r1513508, r1531340, r1531370, r1531962, r1533065, r1540052 from trunk:

Add in rough uds support (Bugx 54101) from Blaise Tarr <blaise.tarr@gmail.com>

Make AF_UNIX aware... fix Windows/Netware??

Follow-up to r1451905 to fix NetWare/Windows compilation.

apr trunk-able

message tag for dom sock

Note about new UDS support

UDS subsequent request on a connection fix

Reformat the UDS support inline with a new naming structure.
Use a flag for speed for testing.

syntax sugar... if the worker is associated w/ a UDS,
then make sure the log reporting has a visual clue.

Ensure that userland format of UDS is the same as how it is
configured, no matter how we store and use it internally.

Eclipse code analysis warning

UDS urls need to be desockified when configuring...
Submitted by: jim, fuankg, jim, jim, druggeri, druggeri, jim, jim, jim, jim, jim
Reviewed/backported by: jim

git-svn-id: https://svn.apache.org/repos/asf/httpd/httpd/branches/2.4.x@1560081 13f79535-47bb-0310-9956-ffa450edef68