[Bug 1953426] Re: [SRU] configurable threshold for reaping dead connections and add a unit test

[gerald.yang]

** Description changed:

  [Impact]
  add a configurable threshold for reaping dead connections and fix cephfs test case
  
  [Test plan]
  run ceph qa tests in: qa/tasks/cephfs/test_sessionmap.py
  this also verifies the configurable threshold
  
  steps to run:
  1. build ceph from source folder
  2. go to build folder
  3. run all tests in test_sessionmap.py, e.g.
  python ../qa/tasks/vstart_runner.py tasks.cephfs.test_sessionmap.TestSessionMap.test_mount_conn_close
  python ../qa/tasks/vstart_runner.py tasks.cephfs.test_sessionmap.TestSessionMap.test_tell_session_drop
  ...
  
  [Where problems could occur]
- None, only add a configuration and also be tested by ceph qa tests
+ these patches only add a configuration and fix the test case
+ it can also be tested by ceph qa tests explained above
+ and they also passed all the qa tests upstream and been merged by upstream, I don't think there will be any regression
  
  [Other info]
  from upstream:
  octopus backport tracker
  https://tracker.ceph.com/issues/51199
  
  octopus backport PR
  https://github.com/ceph/ceph/pull/43310

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https://bugs.launchpad.net/bugs/1953426

Title:
  [SRU] configurable threshold for reaping dead connections and add a
  unit test

Status in ceph package in Ubuntu:
  In Progress
Status in ceph source package in Focal:
  In Progress

Bug description:
  [Impact]
  add a configurable threshold for reaping dead connections and fix cephfs test case

  [Test plan]
  run ceph qa tests in: qa/tasks/cephfs/test_sessionmap.py
  this also verifies the configurable threshold

  steps to run:
  1. build ceph from source folder
  2. go to build folder
  3. run all tests in test_sessionmap.py, e.g.
  python ../qa/tasks/vstart_runner.py tasks.cephfs.test_sessionmap.TestSessionMap.test_mount_conn_close
  python ../qa/tasks/vstart_runner.py tasks.cephfs.test_sessionmap.TestSessionMap.test_tell_session_drop
  ...

  [Where problems could occur]
  these patches only add a configuration and fix the test case
  it can also be tested by ceph qa tests explained above
  and they also passed all the qa tests upstream and been merged by upstream, I don't think there will be any regression

  [Other info]
  from upstream:
  octopus backport tracker
  https://tracker.ceph.com/issues/51199

  octopus backport PR
  https://github.com/ceph/ceph/pull/43310

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