exporter/signalfx: Reinstate network/filesystem translation rules

[asuresh4]

Description: Reinstate network/filesystem translations.

• revert exporter/signalfx: Remove redundant network and filesystem translations #2161
• rearranged some rules and add comments for readability
• handle changes from Rename host metrics according to metrics spec opentelemetry-collector#2311
  • added rename_dimension_keys rule for network metrics (renaming of interface label to device)
  • updated system.disk.ops -> system.disk.operations

[codecov]

Codecov Report

Merging #2171 (2ebd904) into master (6906dd9) will increase coverage by 0.00%.
The diff coverage is n/a.

@@           Coverage Diff           @@
##           master    #2171   +/-   ##
=======================================
  Coverage   90.44%   90.44%           
=======================================
  Files         397      397           
  Lines       19565    19565           
=======================================
+ Hits        17695    17696    +1     
+ Misses       1407     1406    -1     
  Partials      463      463           

Flag	Coverage Δ
integration	69.41% <ø> (+0.06%)	⬆️
unit	89.24% <ø> (+<0.01%)	⬆️

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Impacted Files	Coverage Δ
processor/groupbytraceprocessor/event.go	96.77% <0.00%> (+0.80%)	⬆️

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