Add Sftp nodes and chan

[quentinql]

No description provided.

[codecov-commenter]

Codecov Report

Merging #179 (39e82d9) into master (da9d583) will decrease coverage by 6.62%.
Report is 96 commits behind head on master.
The diff coverage is 0.59%.

❗ Current head 39e82d9 differs from pull request most recent head b1b91d0. Consider uploading reports for the commit b1b91d0 to get more accurate results

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@@            Coverage Diff             @@
##           master     #179      +/-   ##
==========================================
- Coverage   67.62%   61.01%   -6.62%     
==========================================
  Files          35       36       +1     
  Lines        2907     2945      +38     
==========================================
- Hits         1966     1797     -169     
- Misses        941     1148     +207     

Files Changed	Coverage Δ
pypeman/contrib/sftp.py	0.00% <0.00%> (ø)
pypeman/channels.py	68.83% <100.00%> (-15.90%)	⬇️

... and 31 files with indirect coverage changes

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