KCM: Clean the pipe after the test has finished

Tests where sometimes failing because they were opening the pipe
while KCM was shutting down. This was happening because tests were
successfully opening the pipe because it was left over by the
previous instance of KCM. So to avoid this we immediately remove
the pipe during teardown. With this, tests will fail to open it
and keep trying until it is re-created by the new instance of KCM.

src/tests/intg/test_kcm.py

@@ -116,6 +116,11 @@ def kcm_teardown():
         except OSError as osex:
             if osex.errno == 2:
                 pass
+        try:
+            os.unlink(abs_sock_path)
+        except OSError as osex:
+            if osex.errno == 2:
+                pass
 
     request.addfinalizer(kcm_teardown)
     return kcm_pid