groot/riofs: implement recursive Dir.Put and Dir.Mkdir

[sbinet]

No description provided.

[codecov-io]

Codecov Report

Merging #500 into master will increase coverage by <.01%.
The diff coverage is 69.76%.

@@            Coverage Diff             @@
##           master     #500      +/-   ##
==========================================
+ Coverage    63.7%   63.71%   +<.01%     
==========================================
  Files         354      354              
  Lines       41622    41701      +79     
==========================================
+ Hits        26515    26569      +54     
- Misses      12738    12754      +16     
- Partials     2369     2378       +9

Impacted Files	Coverage Δ
groot/riofs/key.go	74.9% <100%> (+0.19%)	⬆️
groot/riofs/walk.go	67.85% <60.31%> (-7.15%)	⬇️
groot/riofs/dir.go	77.46% <95.23%> (+1.3%)	⬆️
xrootd/session.go	72.72% <0%> (-0.8%)	⬇️
rio/rio.go	48.57% <0%> (-0.41%)	⬇️

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