Update directory to find performance graphs in for syncing to SF in nightly
Update directory to find performance graphs in for syncing to SF in nightly

I thought cronlogdir would be NightlyPerformance for performance and compiler
performance testing, but that's only true for performance testing. This
switches to use CHPL_TEST_PERF_DIR and CHPL_TEST_COMP_PERF_DIR which are
directly responsible for telling start_test where to put the graphs and html
directory.

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