Viktor Szakats bc120a343b tests: retry KEX failures when using the WinCNG backend ...

Twice. This tests are flaky and we haven't figured out why. In the
meantime use this workaround to test and log these issues, but also
ensure that CI run aren't flagged red because of it.

Also:
- kex: add debug message when hostkey `sig_verify` fails,
  to help tracking WinCNG KEX failures.
- test_ssh2: also add retry logic.
  I'm not quite sure this is correct. Please let me know.
- session_fixture: bump up `src_path` slots to fit retries and show
  message when hitting the limit.
- session_fixture: clear `kbd_password` static variable after use.
- session_fixture: close and deinit socket after use.
- session_fixture: deinit libssh2 after use.

Ref: #804 #846 #979 #1012 #1015

Cherry-picked from #1017
Closes #1023

2023-05-03 12:30:38 +00:00

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