config: requestTTY implementation and configuration support with values no/yes/auto/force

sudharshan hegderequested to merge
sudharshanhegde68/libssh-mirror:request-tty-support into master

RequestTTY is currently mapped to SOC_NA, it is silently discarded when parsed from ~/.ssh/config. This patch will promote it to a first class option, so that applications can control whether a pseudo-terminal is requested for the session, matching OpenSSH's behavior with values no, yes, auto, and force.

Checklist

  • Commits have Signed-off-by: with name/author being identical to the commit author
  • Code modified for feature
  • Test suite updated with functionality tests
  • Test suite updated with negative tests
  • Documentation updated

Reviewer's checklist:

  • Any issues marked for closing are addressed
  • There is a test suite reasonably covering new functionality or modifications
  • Function naming, parameters, return values, types, etc., are consistent and according to CONTRIBUTING.md
  • This feature/change has adequate documentation added
  • No obvious mistakes in the code

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