Add ability to build gotgt without cgo

Signed-off-by: Chris Koch <chrisko@google.com>

cmd/daemon.go

@@ -29,7 +29,6 @@ import (
 	_ "github.com/gostor/gotgt/pkg/port/iscsit"
 	"github.com/gostor/gotgt/pkg/scsi"
 	_ "github.com/gostor/gotgt/pkg/scsi/backingstore"
-	_ "github.com/gostor/gotgt/pkg/scsi/backingstore/cephstore"
 	log "github.com/sirupsen/logrus"
 	"github.com/spf13/cobra"
 )

cmd/daemon_cgo.go

@@ -0,0 +1,22 @@
+// Copyright 2016 The GoStor Authors All rights reserved.
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+//    http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+// Only include cephstore when building with cgo.
+// +build cgo
+
+package cmd
+
+import (
+	_ "github.com/gostor/gotgt/pkg/scsi/backingstore/cephstore"
+)