[Bug 1989365] [NEW] test_omit_all_processes_except_one is racy and fails sometimes

[Benjamin Drung]

Public bug reported:

The test case test_omit_all_processes_except_one is racy and fails
sometimes:

```
test_omit_all_processes_except_one (tests.system.test_unkillable_shutdown.TestUnkillableShutdown)
unkillable_shutdown will write exactly one report. ... Running as unit: run-r0b0d3fe87473410c9eb61a5ae4635938.service
FAIL
======================================================================
FAIL: test_omit_all_processes_except_one (tests.system.test_unkillable_shutdown.TestUnkillableShutdown)
unkillable_shutdown will write exactly one report.
----------------------------------------------------------------------
Traceback (most recent call last):
  File "/tmp/autopkgtest.JJoBfX/autopkgtest_tmp/tests/system/test_unkillable_shutdown.py", line 96, in test_omit_all_processes_except_one
    pid = self._launch_process_with_different_session_id(existing_pids)
  File "/tmp/autopkgtest.JJoBfX/autopkgtest_tmp/tests/system/test_unkillable_shutdown.py", line 90, in _launch_process_with_different_session_id
    self.assertEqual(len(test_executable_pids), 1, test_executable_pids)
AssertionError: 0 != 1 : set()

----------------------------------------------------------------------
```

autopkgtest log: https://autopkgtest.ubuntu.com/results/autopkgtest-
kinetic/kinetic/amd64/a/apport/20220912_055849_5f03e@/log.gz

** Affects: apport
     Importance: High
         Status: New

** Affects: apport (Ubuntu)
     Importance: High
         Status: New

** Also affects: apport
   Importance: Undecided
       Status: New

** Changed in: apport (Ubuntu)
   Importance: Undecided => High

** Changed in: apport
   Importance: Undecided => High

** Changed in: apport
    Milestone: None => 2.24.0

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https://bugs.launchpad.net/bugs/1989365

Title:
  test_omit_all_processes_except_one is racy and fails sometimes

Status in Apport:
  New
Status in apport package in Ubuntu:
  New

Bug description:
  The test case test_omit_all_processes_except_one is racy and fails
  sometimes:

  ```
  test_omit_all_processes_except_one (tests.system.test_unkillable_shutdown.TestUnkillableShutdown)
  unkillable_shutdown will write exactly one report. ... Running as unit: run-r0b0d3fe87473410c9eb61a5ae4635938.service
  FAIL
  ======================================================================
  FAIL: test_omit_all_processes_except_one (tests.system.test_unkillable_shutdown.TestUnkillableShutdown)
  unkillable_shutdown will write exactly one report.
  ----------------------------------------------------------------------
  Traceback (most recent call last):
    File "/tmp/autopkgtest.JJoBfX/autopkgtest_tmp/tests/system/test_unkillable_shutdown.py", line 96, in test_omit_all_processes_except_one
      pid = self._launch_process_with_different_session_id(existing_pids)
    File "/tmp/autopkgtest.JJoBfX/autopkgtest_tmp/tests/system/test_unkillable_shutdown.py", line 90, in _launch_process_with_different_session_id
      self.assertEqual(len(test_executable_pids), 1, test_executable_pids)
  AssertionError: 0 != 1 : set()

  ----------------------------------------------------------------------
  ```

  autopkgtest log: https://autopkgtest.ubuntu.com/results/autopkgtest-
  kinetic/kinetic/amd64/a/apport/20220912_055849_5f03e@/log.gz

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