Provide some race resilience for the task pulse check

There are observable cases where it might take a very short while
for the process to appear and thus the task be considered alive
so make sure the overall check makes at least a few tries within
a ten second window.

Signed-off-by: Plamen Dimitrov <plamen.dimitrov@intra2net.com>

Author: pevogam

optional_plugins/spawner_remote/avocado_spawner_remote/__init__.py

@@ -4,6 +4,7 @@
 import logging
 import os
 import shlex
+import time
 
 from aexpect import exceptions, remote
 
@@ -137,9 +138,14 @@ def is_task_alive(runtime_task):
         # since each test is a session detached process, it is reasonable
         # to reuse the same session with a new command
         session = runtime_task.spawner_handle
-        status, _ = session.cmd_status_output(
-            f"pgrep -r R,S -f {runtime_task.task.identifier}"
-        )
+        for _ in range(10):
+            status, output = RemoteSpawner.run_remote_cmd(
+                session, f"pgrep -r R,S -f {runtime_task.task.identifier}", 10
+            )
+            LOG.debug(output)
+            if status == 0:
+                break
+            time.sleep(1)
         return status == 0
 
     @with_slot_reservation