Add option to share the ids from the parent for rpc servers

[jmoney]

Signed-off-by: Jonathan Monette jon.monette@gmail.com

Which problem is this PR solving?

• Fixes: Parent and span IDs are not shared for rpc traces #400

Short description of the changes

• Added a configuration option to share the parendId and spanId between the child and parent for span.kind=rpc. This was already implemented in the java tracer but the node tracer seems to be missing this option. Java configuration for reference: https://github.com/jaegertracing/jaeger-client-java/blob/master/jaeger-core/src/main/java/io/jaegertracing/internal/JaegerTracer.java#L613-L616

[codecov]

Codecov Report

Merging #399 into master will increase coverage by 0.15%.
The diff coverage is 100%.

@@            Coverage Diff            @@
##           master    #399      +/-   ##
=========================================
+ Coverage   98.65%   98.8%   +0.15%     
=========================================
  Files          50      50              
  Lines        2010    2013       +3     
  Branches      377     379       +2     
=========================================
+ Hits         1983    1989       +6     
+ Misses         27      24       -3

Impacted Files	Coverage Δ
src/configuration.js	98.97% <ø> (ø)	⬆️
src/tracer.js	100% <100%> (ø)	⬆️
src/span_context.js	95.52% <0%> (+2.23%)	⬆️

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[yurishkuro]

Thanks!