[PATCH 2 of 7] tests: make killdaemons.py use DAEMON_PIDS by default

[Matt Mackall]

# HG changeset patch
# User Matt Mackall <mpm at selenic.com>
# Date 1433791305 18000
#      Mon Jun 08 14:21:45 2015 -0500
# Node ID 5f79c9bae94e73c8087229f91e0d55de39b104d5
# Parent  76bcb941ef7cd6811bda0b40c4af1ec02e76dc30
tests: make killdaemons.py use DAEMON_PIDS by default

diff -r 76bcb941ef7c -r 5f79c9bae94e tests/killdaemons.py
--- a/tests/killdaemons.py	Mon Jun 08 14:44:30 2015 -0500
+++ b/tests/killdaemons.py	Mon Jun 08 14:21:45 2015 -0500
@@ -87,5 +87,9 @@
         pass
 
 if __name__ == '__main__':
-    path, = sys.argv[1:]
+    if len(sys.argv) > 1:
+        path, = sys.argv[1:]
+    else:
+        path = os.environ["DAEMON_PIDS"]
+
     killdaemons(path)