Add an option to disable native stack dumping on SIGQUIT.

Some of our (stress) run-tests do ANR dumping, which end up
stressing libunwind, that has known problems. To avoid getting
flakes due to libunwind, disable native stack dumping on SIGQUIT
for our run-tests.

bug:27185632
bug:24664297
Change-Id: I69085e48db903d6240448d71666ae2dcd091922e