Changes to http span name

[trask]

Fixes #2998

Changes

Changes http server span names from

• {http.route} to {http.method} {http.route} (when route is available)
• HTTP {http.method} to {http.method} (when route is not available)

Changes http client span names from

• HTTP {http.method} to {http.method}

[Oberon00]

HTTP {http.method} to {http.method} (when route is not available)

What was the rationale for this?

[trask]

What was the rationale for this?

this was done to make the span name consistent between the cases where http.route is available and is not available