add a test-case where it is used in stackable fashion.

I should have done it this way from the very start, rather than
muck about with director configurations in VCC...

created.

Split the demo-rr director into its own file

to eliminate any chance of collissions.

Check the ABI.  This check may be too strong, but at least its safe.

that purpose.

Add a delay after setting parameters to allow acceptor thread to pick them up.

Add a delay in c1 after receiving result to allow time for any fail causing
fetches from s2

never be reached.

Split out the param settings, so we can see the previous values.

Fixes: #1222

foo

Fixes #1258

It's in it's own file now, based on the VCL manpage.