Move printLogs from oci.go to sandbox.go

It's not OCI-specific, so it makes more sense in the file that exports
it to the world.

Signed-off-by: Paul "TBBle" Hampson <Paul.Hampson@Pobox.com>

util/testutil/integration/oci.go

@@ -1,8 +1,6 @@
 package integration
 
 import (
-	"bufio"
-	"bytes"
 	"fmt"
 	"log"
 	"os"
@@ -68,13 +66,3 @@ func (s *oci) New(cfg *BackendConfig) (Backend, func() error, error) {
 		rootless: s.uid != 0,
 	}, stop, nil
 }
-
-func printLogs(logs map[string]*bytes.Buffer, f func(args ...interface{})) {
-	for name, l := range logs {
-		f(name)
-		s := bufio.NewScanner(l)
-		for s.Scan() {
-			f(s.Text())
-		}
-	}
-}

util/testutil/integration/sandbox.go

@@ -212,3 +212,13 @@ func rootlessSupported(uid int) bool {
 	}
 	return true
 }
+
+func printLogs(logs map[string]*bytes.Buffer, f func(args ...interface{})) {
+	for name, l := range logs {
+		f(name)
+		s := bufio.NewScanner(l)
+		for s.Scan() {
+			f(s.Text())
+		}
+	}
+}