SERVER-7743: add low-level socket error info to BackgroundJob
SERVER-10026 temporary js tests with explain removed

Signed-off-by: Matt Kangas <matt.kangas@mongodb.com>
Revert "SERVER-7743: add low-level socket error info to BackgroundJob"

This reverts commit 86241d5da584018ef9bcfa779c1cc47459f2d155.