Update opentracing nginx module

[aledbf]

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[codecov-io]

Codecov Report

Merging #2675 into master will not change coverage.
The diff coverage is n/a.

@@           Coverage Diff           @@
##           master    #2675   +/-   ##
=======================================
  Coverage   40.93%   40.93%           
=======================================
  Files          72       72           
  Lines        5088     5088           
=======================================
  Hits         2083     2083           
  Misses       2721     2721           
  Partials      284      284

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