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

[gerald.yang]

Public bug reported:

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


[Test case]
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
...


[Regression potential]
only add a configuration, no regression potential

[Additional information]
from upstream:
octopus backport tracker
https://tracker.ceph.com/issues/51199

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

** Affects: ceph (Ubuntu)
     Importance: Undecided
     Assignee: gerald.yang (gerald-yang-tw)
         Status: In Progress

** Affects: ceph (Ubuntu Focal)
     Importance: Undecided
         Status: New

** Changed in: ceph (Ubuntu)
       Status: New => In Progress

** Changed in: ceph (Ubuntu)
     Assignee: (unassigned) => gerald.yang (gerald-yang-tw)

** Also affects: ceph (Ubuntu Focal)
   Importance: Undecided
       Status: New

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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:
  New

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

  
  [Test case]
  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
  ...

  
  [Regression potential]
  only add a configuration, no regression potential

  [Additional information]
  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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