Updating network connection attributes names to latest in spec

[hectorhdzg]

Updating names to latest in spec

https://github.com/open-telemetry/opentelemetry-specification/blob/master/specification/data-span-general.md#general-network-connection-attributes

[codeboten]

LGTM, one non-blocking question: is it worth updating the WSGI integration at the same time?

opentelemetry-python/ext/opentelemetry-ext-wsgi/src/opentelemetry/ext/wsgi/__init__.py

Line 111 in b01f7e8

result["peer.hostname"] = remote_host

[codecov-io]

Codecov Report

Merging #350 into master will decrease coverage by 0.05%.
The diff coverage is 33.33%.

@@            Coverage Diff             @@
##           master     #350      +/-   ##
==========================================
- Coverage   84.82%   84.77%   -0.06%     
==========================================
  Files          38       38              
  Lines        1839     1839              
  Branches      217      217              
==========================================
- Hits         1560     1559       -1     
  Misses        214      214              
- Partials       65       66       +1

Impacted Files	Coverage Δ
...ry-ext-wsgi/src/opentelemetry/ext/wsgi/__init__.py	68.18% <33.33%> (ø)	⬆️
...emetry-sdk/src/opentelemetry/sdk/trace/__init__.py	89.45% <0%> (-0.43%)	⬇️

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