sftp: Only connect once to server during init
#3882
Merged
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What does this PR change? What problem does it solve?
This is especially useful if ssh asks for a password or if closing the initial connection could return an error due to a problematic server implementation.
Was the change previously discussed in an issue or on the forum?
Fixes #2152
Checklist
[ ] I have added documentation for relevant changes (in the manual).changelog/unreleased/
that describes the changes for our users (see template).gofmt
on the code in all commits.