[PR] Run the initial request with a nonpositive retry timeout [libcloud]

["zhechen-cs (via GitHub)" <gi...@apache.org>]

zhechen-cs opened a new pull request, #2199:
URL: https://github.com/apache/libcloud/pull/2199

   ### Description
   
   Always run the initial request in `MinimalRetry` and `Retry`, including when the timeout is zero or negative. Previously these values skipped the request and raised an unrelated `TypeError` from `raise None`.
   
   If the request fails after the deadline, propagate its exception without sleeping. Regression tests cover both retry classes, successful results, retryable connection and rate-limit errors, and non-retryable errors.
   
   Fixes https://github.com/apache/libcloud/issues/2198
   
   ### Status
   
   Ready for review.
   
   ### Validation
   
   - Common, connection, utility and HTTP tests: 213 passed, 1 skipped, 16 subtests passed (Python 3.12; `NO_INTERNET=1`, loopback proxy bypass).
   - New regressions fail on the unmodified production code.
   - Black, isort, flake8, pylint and `git diff --check` pass for the changed files.
   - The full provider matrix and live cloud integration tests were not run.
   
   ### Checklist
   
   - [x] Code linting
   - [ ] Documentation (no public API change)
   - [x] Tests
   - [ ] ICLA (small bug fix)
   


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