Flatten the bridge/opentracing/internal package into bridge/opentracing package

[Leoff00]

Fixes: #6563

Now mock_test.go file is in the bridge/opentracing level. The functions and variables inside are now unexportable.

in bridge_grpc_test.go i needed to rewrite the same behavior of mock_test.go (didn't find a better way, because now mock_test.go file is unexportable.

componentKey and serviceKey variables was removed by uselessness

[linux-foundation-easycla[bot]]

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• :white_check_mark: login: Leoff00 / name: Leonardo Ferreira (e9f40328b97c9730e2c4e013b1da94b7cfcb7495, fa9121ae583976163d3b215542c17ee79950aaad, 69798e095dca8faf2034a1448888e73791581f4e, 65fdbf47419d4de967224cdbc6b052e3b0a7952a, b6d340a3ce3e69ec57945fe413d152ef9ade94fb, 7f4189d2bc12cbe0370de2788f90e74e69c006a0, 48fff7dc029c9004f7a2960909fbdaef63110040, dc3b7f31f28939e93f9ff41d890e982a342aea18, 5693ab611160c99dd7dd2edbd2b6c782a0f5b9a0, b843ef680ab34a09cc37872012edc273fab1e73b, a652d6ef6fc1591f365b3a9efb74247819180398, 483c2d7412e7942d583a6a4c93ed66758c982799)

[dmathieu]

Could you fix the conflicts?

[MrAlias]

#6916 resolved the issue this is addressing.