run-tests: exit cleanly if parallel run is interrupted
If interrupted while running with "--jobs N", run-tests asynchronously
spewed a bunch of output and backtraces from both the master and
slave processes, leaving the terminal full of goop. This patch makes
it behave more sensibly.
$ hg init
$ touch unknown
$ touch a
$ hg add a
$ hg ci -m "1"
$ touch b
$ hg add b
$ hg ci -m "2"
Should show unknown
$ hg status
? unknown
$ hg revert -r 0 --all
removing b
Should show unknown and b removed
$ hg status
R b
? unknown
Should show a and unknown
$ ls
a
unknown