Go HTTP client use root span and ignore spanID comparison
Go HTTP client use root span and ignore spanID comparison

All client tests pass, after a consultation from @rakyll and @ramonza
on how to properly get back the span information to compare.

census-ecosystem/opencensus-experiments,census-ecosystem/opencensus-experiments,census-ecosystem/opencensus-experiments,census-ecosystem/opencensus-experiments,census-ecosystem/opencensus-experiments,census-ecosystem/opencensus-experiments,census-ecosystem/opencensus-experiments