fix: single-connection mode connection reestablishment #39
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Previously there was no logic to handle an existing connection that was e.g. closed. This PR handles that case by attempting to read from the underlying connection before writing to it, and reestablishing on an EOF condition or specific errors.
Single-connection mode was also enabled on the TACACS+ NG test server image, since I didn't realize it wasn't enabled by default.
Fixes #38