baggageclaim: fix streaming traces
baggageclaim: fix streaming traces

needed to extract the tracing info from the request header to properly
connect the traces to the client request from the ATC

Signed-off-by: Taylor Silva <33b075afcd0610c62dcb82fe76b4c1adc69221da@pivotal.io>

concourse/concourse,concourse/concourse,concourse/concourse,concourse/concourse,concourse/concourse