* Update Helloworld unit test error message to make it actionable
Update error message with detailed explanation so that developers know how to debug if unit test ever failed.
Fix a bug in unit test.
Update all READMEs so that they are valid
* Feedback updates
* serving/samples: update helloworld-go to go:1.13 and go modules
* seving/samples: sync helloworld-go Dockerfile to README
* alpine:3.10 => alpine:3
* serving/samples: helloworld-go name binary helloworld-server
* serving/samples: simpler comment for go build in helloworld-go
* serving/samples: helloworld-go README sync
* serving/samples: fix up README
* serving/samples: add go.mod to test config
* serving/samples: Add instruction to create a go.mod
* rename hellworld-java to helloworld-java-spring
* updated sampleapp test
* Updated sample test app tmp directory
* Renamed service name and instructions to reflect helloworld-java-spring
Adam Ross
chaodaiG
Adriano Cunha
Ray Tsang