tests: Move MustAbsPath function to testutils

Signed-off-by: Marek Siarkowicz <siarkowicz@google.com>

tests/framework/integration/testing.go

@@ -16,7 +16,6 @@ package integration
 
 import (
 	"os"
-	"path/filepath"
 	"testing"
 
 	grpc_logsettable "github.com/grpc-ecosystem/go-grpc-middleware/logging/settable"
@@ -113,14 +112,6 @@ func assertInTestContext(t testutil.TB) {
 	}
 }
 
-func MustAbsPath(path string) string {
-	abs, err := filepath.Abs(path)
-	if err != nil {
-		panic(err)
-	}
-	return abs
-}
-
 func NewEmbedConfig(t testing.TB, name string) *embed.Config {
 	cfg := embed.NewConfig()
 	cfg.Name = name