Fix ITs in TeamCity (#1036)

For god know what reason (couldn't reproduce locally, tried every trick in
the book), boltkit shutting down Neo4j after the ITs would timeout consistently
in TeamCity. Since the service is (at least currently) started and stopped for
the whole test session, not per test, there's little risk in just killing it
instead of gracefully shutting it down.

Author: robsdedude

tests/integration/conftest.py

@@ -92,7 +92,9 @@ def start(self, timeout=None):
 
     def stop(self, timeout=None):
         from shutil import rmtree
-        self.controller.stop()
+        # Killing the process as waiting for it to gracefully shutdown
+        # timed out on team city, not sure why.
+        self.controller.stop(kill=True)
         rmtree(self.home)
 
     def machines(self):