fix SpanKind type assertion in opentracing bridge

[Prajithp]

We have system which supports multiple distributed tracing systems. When using opentracing bridge, all the spankinds are created as INTERNAL due to type assertion issue in bridge module.

[linux-foundation-easycla[bot]]

The committers listed above are authorized under a signed CLA.

• :white_check_mark: login: Prajithp / name: Prajith (bf1d89d283b891a6e1af0ab7bbc04a9bec765323, 48833d75fa6b72dfbc97c767d8b489762e229880)

[dmathieu]

Can you fix the tests?

[Prajithp]

@dmathieu Done. I have already signed the CLA document.

[codecov[bot]]

Codecov Report

Merging #2898 (784aed8) into main (d96e8d2) will decrease coverage by 0.0%. The diff coverage is 100.0%.

@@           Coverage Diff           @@
##            main   #2898     +/-   ##
=======================================
- Coverage   76.2%   76.2%   -0.1%     
=======================================
  Files        179     179             
  Lines      11939   11940      +1     
=======================================
- Hits        9103    9102      -1     
- Misses      2596    2598      +2     
  Partials     240     240             

Impacted Files	Coverage Δ
bridge/opentracing/bridge.go	62.3% <100.0%> (+<0.1%)	:arrow_up:
exporters/jaeger/jaeger.go	90.3% <0.0%> (-0.9%)	:arrow_down:

[hanyuancheung]

Seems like the CLA is not signed yet, could you pls check again and fix it? @Prajithp

[Prajithp]

@hanyuancheung Tried multiple times by signing the Doc. After clicking the Finish button, page is redirecting back to Github without any messages