tests/conftest: stop coordinator/exporter via SIGINT

Since labgrid switched to gRPC, SIGTERM prevents coverage from writing
its data, use SIGINT instead.

Signed-off-by: Bastian Krause <[email protected]>

tests/conftest.py

@@ -1,5 +1,5 @@
 import logging
-from signal import SIGTERM
+from signal import SIGINT
 import sys
 import threading
 
@@ -57,9 +57,11 @@ def __init__(self, cwd):
     def stop(self):
         logging.info("stopping {self.__class__.__name__} pid=%s", self.spawn.pid)
 
-        # let coverage write its data:
+        # Let coverage write its data:
         # https://coverage.readthedocs.io/en/latest/subprocess.html#process-termination
-        self.spawn.kill(SIGTERM)
+        # Since labgrid switched to gRPC, SIGTERM prevents coverage from writing its data, use
+        # SIGINT instead.
+        self.spawn.kill(SIGINT)
         if not self.spawn.closed:
             self.spawn.expect(pexpect.EOF)
             self.spawn.wait()