Calculate chpldoc based off compiler in sub_test, instead of assuming it is simply chpldoc.
Calculate chpldoc based off compiler in sub_test, instead of assuming it is simply chpldoc.

This works better in cases where an absolute path to compiler is provided
(e.g. in paratest).

CoryMcCartan/chapel,hildeth/chapel,CoryMcCartan/chapel,hildeth/chapel,CoryMcCartan/chapel,CoryMcCartan/chapel,hildeth/chapel,chizarlicious/chapel,hildeth/chapel,chizarlicious/chapel,chizarlicious/chapel,hildeth/chapel,CoryMcCartan/chapel,CoryMcCartan/chapel,chizarlicious/chapel,hildeth/chapel,chizarlicious/chapel,chizarlicious/chapel,CoryMcCartan/chapel,chizarlicious/chapel,hildeth/chapel