Fix test script to fail sequentially and correctly capture data race results

Signed-off-by: John Tuley <jtuley@pivotallabs.com>
Prevent race condition in WebsocketServer

Signed-off-by: John Tuley <jtuley@pivotallabs.com>
Bump loggregatorlib to 868332f to eliminate race condition

Signed-off-by: John Tuley <jtuley@pivotallabs.com>