Changes to tests that run on Travis

- Remove code coverage from Travis and add it to a GitHub Action
that will be run as a nightly.
- Use tag builds to exclude some tests, such as the "norace" or
JS tests. Since "go test" does not support "negative" regexs, there
is no other way.

Signed-off-by: Ivan Kozlovic <ivan@synadia.com>

scripts/cov.sh

@@ -1,23 +1,26 @@
-#!/bin/bash -e
+#!/bin/bash
 # Run from directory above via ./scripts/cov.sh
 
+# Do not set the -e flag because we don't a flapper to prevent the push to coverall.
+
 export GO111MODULE="on"
 
-go get github.com/mattn/goveralls
-go get github.com/wadey/gocovmerge
+go install github.com/wadey/gocovmerge@latest
 
 rm -rf ./cov
 mkdir cov
-go test -v -failfast -covermode=atomic -coverprofile=./cov/conf.out -run='Test[^NoRace]' ./conf -timeout=20m
-go test -v -failfast -covermode=atomic -coverprofile=./cov/log.out -run='Test[^NoRace]' ./logger -timeout=20m
-go test -v -failfast -covermode=atomic -coverprofile=./cov/server.out -run='Test[^NoRace]' ./server -timeout=20m
-go test -v -failfast -covermode=atomic -coverprofile=./cov/test.out -coverpkg=./server -run='Test[^NoRace]' ./test -timeout=20m
+# Since it is difficult to get a full run without a flapper, do not use `-failfast`.
+# It is better to have one flapper or two and still get the report than have
+# to re-run the whole code coverage. One or two failed tests should not affect
+# so much the code coverage.
+go test -v -covermode=atomic -coverprofile=./cov/conf.out ./conf -timeout=20m -tags=skip_no_race_tests
+go test -v -covermode=atomic -coverprofile=./cov/log.out ./logger -timeout=20m -tags=skip_no_race_tests
+go test -v -covermode=atomic -coverprofile=./cov/server.out ./server -timeout=20m -tags=skip_no_race_tests
+go test -v -covermode=atomic -coverprofile=./cov/test.out -coverpkg=./server ./test -timeout=20m -tags=skip_no_race_tests
 gocovmerge ./cov/*.out > acc.out
 rm -rf ./cov
 
-# Without argument, launch browser results. We are going to push to coveralls only
-# from Travis.yml and after success of the build (and result of pushing will not affect
-# build result).
+# If no argument passed, launch a browser to see the results.
 if [[ $1 == "" ]]; then
     go tool cover -html=acc.out
 fi