RFC: Should spans be reported for websocket client connections

[objectiser]

When instrumenting a service using websockets, it also reports spans for the HTTP communications to establish the inbound and outbound connections: https://github.com/opentracing-contrib/java-spring-cloud/pull/53#issuecomment-331924207

Options:

• Leave as is, and use this information to know when and how many connections are being made. If so - might be good to see if websocket message spans can be correlated to the session connection spans in some way
• Automatically register skip patterns for the inbound/outbound path prefixes