Dr. Heapstat tests of data output

_From [derek.br...@gmail.com](https://code.google.com/u/117968039472581148324/) on December 10, 2010 19:52:12_

PR 470723

my initial Dr. Heapstat uses the Dr. Memory
tests stdout/stderr checks, so we ensure the tests run properly. but I
have no check that Dr. Heapstat outputs the proper data.

should also add a nudge test

need to add leak suppression tests too
- enabled nudge test for Dr. Heapstat
This was more work than expected:
- had to add a syslog for Windows nudge to know when received
- sideline thread difficult to kill w/o killing ctest: using pkill
for now
- added -pid_file support to drheapstat.pl

_Original issue: http://code.google.com/p/drmemory/issues/detail?id=211_