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What does this PR do?

Fixes a file descriptor leak in logger reinitialisation logic.
Whenever there is problem with the logger, it is reinitialized.
Reinitialisation entails creating a new logger instance.
The problem is that the old instance is not being closed.
The logger uses a SocketHandler, which opens a socket.
This handler needs to be closed, otherwise file descriptor that corresponds to the opened socket "leaks".
If the logger is reinitialised many times the process runs out of available file descriptors.

Description of the Change

Whenever the logger is reinitialised, previously existing instance (if any) is properly closed.

Alternate Designs

Possible Drawbacks

Verification Process

Tested manually using a dockerized Jenkins instance.

Additional Notes

DatadogUtilities#severe was changed to log exception stack trace: the stack trace is the most valuable and useful piece of info, and it is rather troublesome to ask customers to tweak their log levels and reproduce their problem all over again because the exception was not logged the first time.

Release Notes

Review checklist (to be filled by reviewers)

• Feature or bug fix MUST have appropriate tests (unit, integration, etc...)
• PR title must be written as a CHANGELOG entry (see why)
• Files changes must correspond to the primary purpose of the PR as described in the title (small unrelated changes should have their own PR)
• PR must have one changelog/ label attached. If applicable it should have the backward-incompatible label attached.
• PR should not have do-not-merge/ label attached.
• If Applicable, issue must have kind/ and severity/ labels attached at least.