Test logging from a span in the opentracing bridge

[MrAlias]

Based on the chaining of how logging works this needs to also fully test the functionality of:

• LogEvent
• LogEventWithPayload
• Log

opentelemetry-go/bridge/opentracing/bridge.go

Lines 258 to 273 in b98dd5e

	func (s *bridgeSpan) LogEvent(event string) {
	s.LogEventWithPayload(event, nil)
	}
	func (s *bridgeSpan) LogEventWithPayload(event string, payload interface{}) {
	data := ot.LogData{
	Event: event,
	Payload: payload,
	}
	s.Log(data)
	}
	func (s *bridgeSpan) Log(data ot.LogData) {
	record := data.ToLogRecord()
	s.LogFields(record.Fields...)
	}

[tongoss]

@MrAlias , can I take this one?

[tongoss]

@MrAlias , I just notice that these 3 functions have been deprecated, so I just want to confirm whether we still want to add testing?