#5204 set*.test test independence

[Don Porter]

Each of the tests set-old-10.14 and
set-2.[56] and set-4.[56] fail in isolation.

[Don Porter]

Also var-1.[34567] var-3.8 var-3.10 var-5.3 var-6.3
var-7.[34] var-7.1[01] var-18.1.