sftp: Added a new method for creating an sftp session in non-blocking mode

Gérard Gaudeaurequested to merge
ggaudeau1/libssh-mirror:sftp-fix-new-in-nonblocking-mode into master

Added a new method to create a sftp_session object in non-blocking mode. The method also works in blocking mode but I kept the old sftp_new method for compatibility reasons. Added an error message when creating a sftp session if it has not been authenticated.

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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
Edited by Gérard Gaudeau

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