golang format tools (#637)

Produced via:
  `gofmt -s -w $(find -path './vendor' -prune -o -type f -name '*.go' -print))`
  `goimports -w $(find -name '*.go' | grep -v vendor)`
/assign mattmoor

test/webhook-apicoverage/coveragecalculator/coveragedata.go

@@ -18,6 +18,7 @@ package coveragecalculator
 
 import (
 	"strings"
+
 	"k8s.io/apimachinery/pkg/util/sets"
 )
 

test/webhook-apicoverage/view/html_display.go

@@ -17,8 +17,8 @@ limitations under the License.
 package view
 
 import (
-	"strings"
 	"html/template"
+	"strings"
 
 	"knative.dev/pkg/test/webhook-apicoverage/coveragecalculator"
 )
@@ -50,7 +50,6 @@ func GetHTMLDisplay(coverageData []coveragecalculator.TypeCoverage, coverageValu
 	return buffer.String(), nil
 }
 
-
 // GetHTMLCoverageValuesDisplay is a helper method to display coverage values inside a HTML table.
 func GetHTMLCoverageValuesDisplay(coverageValues *coveragecalculator.CoverageValues) (string, error) {