Merge #15687: test: tool wallet test coverage for unexpected writes to wallet

7195fa792fcc19e9c064c4e38814c3b46a210b34 test: Tool wallet test coverage for unexpected writes to wallet (Jon Atack)
3bf2b3a37bbd550491d124b77fd7c1b2a7969f66 test: Split tool_wallet.py test into subtests (Jon Atack)
1eb13f09a9d8c2c7dc69f4cdf1b1ccf632543aa0 test: Add log messages to test/functional/tool_wallet.py (Jon Atack)

Pull request description:

  This pull request adds test coverage in `test/functional/tool_wallet.py` to reproduce unexpected writes to the wallet as described in https://github.com/bitcoin/bitcoin/issues/15608 and serve as a benchmark for fixing the issue:

  - Wallet tool `info` unexpectedly writes to the wallet file if the wallet file permissions are read/write.

  - Wallet tool `info` raises with "Error loading . Is wallet being used by another process?" if the wallet file permissions are read-only.

  Goals:

  1. Reproduce the reported issue, define the current unexpected behavior, and add test coverage to guide a future fix. Add debug-level logging for sanity checking and commented-out assertions to be uncommented when fixing the issue. Add the same coverage to the wallet tool create test and the getwalletinfo test as regression tests while fixing the issue.

  2. Add info log messages as there are currently none in the test file.

  3. Split the tests out to separate functions as per review feedback.

  Thanks to Marco Falke for pointing me in the right direction.

ACKs for top commit:
  laanwj:
    code review ACK 7195fa792fcc19e9c064c4e38814c3b46a210b34

Tree-SHA512: 16a41cce989c8f819cf5b02c6cf8ea84653ede2738fb402f6c36cf4dc075b424dff3e2c73a1cfa1ec9c75f614675baecc71e588845a2596db06ba0957db2df7b

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