[close #619] Shutdown recycler when closing ChannelFactory to avoid resource leak (#618)

[ti-srebot]

cherry-pick #618 to release-3.3
You can switch your code base to this Pull Request by using git-extras:

# In client-java repo:
git pr https://github.com/tikv/client-java/pull/621

After apply modifications, you can push your change to this PR via:

git push git@github.com:ti-srebot/client-java.git pr/621:release-3.3-3724e87df6c0

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Signed-off-by: Daemonxiao 735462752@qq.com

What problem does this PR solve?

Issue Number: close #619

Because the recycler in ChannelFactory does not set any task when TLS is turned off, the process will get stuck on exit.

What is changed and how does it work?

When we don't use TLS, recycler should be null.

Code changes

• Has exported function/method change

Side effects

• NO side effects

Related changes

• Need to cherry-pick to the release branch

[ti-srebot]

/run-all-tests

[codecov]

Codecov Report

❗ No coverage uploaded for pull request base (release-3.3@1267187). Click here to learn what that means.
The diff coverage is n/a.

@@              Coverage Diff               @@
##             release-3.3     #621   +/-   ##
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  Coverage               ?   34.58%           
  Complexity             ?     1419           
==============================================
  Files                  ?      278           
  Lines                  ?    17356           
  Branches               ?     1972           
==============================================
  Hits                   ?     6002           
  Misses                 ?    10748           
  Partials               ?      606           

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[iosmanthus]

LGTM