Span messages are prefixed with Span.<kind> (incorrect behaviour)

[alexvanboxel]

I know this is done intentionally, but it makes the Stackdriver exporter qazi unusable. It is also not semantically correct as it does change the meaning.

Example: If using java auto instrumentation and I want to search for a SELECT statement, I don't expect to need to search for Span.Client-SELECT ...

This is the commit that introduced the change:
a1393af

[alexvanboxel]

If the change is to surface the kind in the UI, it would be better to change the UI and not the name of the span.

[aabmass]

Related #109

[aabmass]

@alexvanboxel we've decided to remove the whole Span.<kind>., should be an easy fix

[tbarker25]

This should be fixed by #155