T98: [sftp] Add support for posix-rename@openssh.com
### Description **Originally reported by asn: https://bugs.libssh.org/T98 ** We should add support for posix-rename@openssh.com which supports renaming with atomic posix semantics. sftp_rename() should use this extension by default if the sftp supports it. ### Comments: **Jakuje commented on 2018-10-09 12:51:04 UTC:** This landed in 6c56c1e0d72670da274f3e77c51a7b4e078d59c6 But it is not yet supported in client (`sftp_rename()`) by default. ---- **asn commented on 2018-10-09 12:55:38 UTC:** We need it on the client side in sftp_rename() ----
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