[swift-ide-test] Print first 20 actual output lines when test in batch completion fails
[swift-ide-test] Print first 20 actual output lines when test in batch completion fails

I found this really useful to understand what’s going wrong

apple/swift,apple/swift,glessard/swift,apple/swift,JGiola/swift,roambotics/swift,glessard/swift,apple/swift,JGiola/swift,benlangmuir/swift,JGiola/swift,benlangmuir/swift,JGiola/swift,roambotics/swift,glessard/swift,roambotics/swift,JGiola/swift,benlangmuir/swift,JGiola/swift,glessard/swift,glessard/swift,roambotics/swift,roambotics/swift,apple/swift,apple/swift,benlangmuir/swift,glessard/swift,benlangmuir/swift,roambotics/swift,benlangmuir/swift