Add root flag to boltdb tests

Needed for CI to run root coverage

Signed-off-by: Derek McGowan <derek@mcgstyle.net> (github: dmcgowan)

snapshot/storage/boltdb/bolt_test.go

@@ -7,6 +7,9 @@ import (
 
 	"github.com/docker/containerd/snapshot/storage"
 	"github.com/docker/containerd/snapshot/storage/testsuite"
+
+	// Does not require root but flag must be defined for snapshot tests
+	_ "github.com/docker/containerd/testutil"
 )
 
 func BenchmarkSuite(b *testing.B) {