Address review comments.

hack/lib/golang.sh

@@ -453,7 +453,7 @@ kube::golang::outfile_for_binary() {
 # Argument: the name of a Kubernetes package.
 # Returns 0 if the binary can be built with coverage, 1 otherwise.
 # NB: this ignores whether coverage is globally enabled or not.
-kube::golang::is_covered_binary() {
+kube::golang::is_instrumented_package() {
   return $(kube::util::array_contains "$1" "${KUBE_COVERAGE_INSTRUMENTED_PACKAGES[@]}")
 }
 
@@ -514,7 +514,7 @@ kube::golang::build_some_binaries() {
   if [[ -n "${build_with_coverage:-}" ]]; then
     local -a uncovered=()
     for package in "$@"; do
-      if kube::golang::is_covered_binary "${package}"; then
+      if kube::golang::is_instrumented_package "${package}"; then
         V=2 kube::log::info "Building ${package} with coverage..."
 
         kube::golang::create_coverage_dummy_test "${package}"

pkg/util/coverage/coverage.go

@@ -49,8 +49,8 @@ func InitCoverage(name string) {
 		coverageFile = "/tmp/k8s-" + name + ".cov"
 	}
 
-	// Set up the unit test framework with the arguments we want.
-	flag.CommandLine.Parse([]string{"-test.coverprofile=" + tempCoveragePath()})
+	// Set up the unit test framework with the required arguments to activate test coverage.
+	flag.CommandLine.Parse([]string{"-test.coverprofile", tempCoveragePath()})
 
 	// Begin periodic logging
 	go wait.Forever(FlushCoverage, flushInterval)
@@ -76,8 +76,6 @@ func FlushCoverage() {
 	// This gets us atomic updates from the perspective of another process trying to access
 	// the file.
 	if err := os.Rename(tempCoveragePath(), coverageFile); err != nil {
-		// This should never fail, because we're in the same directory. There's also little that
-		// we can do if it does.
 		glog.Errorf("Couldn't move coverage file from %s to %s", coverageFile, tempCoveragePath())
 	}
 }