start returning bytes for a range request at the requested starting position

[jackrobison]

No description provided.

[codecov]

Codecov Report

Merging #2179 into master will increase coverage by <.01%.
The diff coverage is 64.28%.

@@            Coverage Diff             @@
##           master    #2179      +/-   ##
==========================================
+ Coverage   76.27%   76.27%   +<.01%     
==========================================
  Files          97       97              
  Lines       11118    11140      +22     
==========================================
+ Hits         8480     8497      +17     
- Misses       2638     2643       +5

Impacted Files	Coverage Δ
lbrynet/extras/daemon/Daemon.py	75.8% <38.46%> (-0.4%)	⬇️
lbrynet/stream/managed_stream.py	91.85% <86.66%> (-0.37%)	⬇️
lbrynet/stream/reflector/server.py	79.33% <0%> (+0.82%)	⬆️
lbrynet/blob/blob_file.py	92.76% <0%> (+0.9%)	⬆️
lbrynet/blob/writer.py	96.29% <0%> (+3.7%)	⬆️

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