Initial delivery of metrics code (#81)

* Initial delivery of metrics code

* Fix build issues

* Fix build issue with go vet

vendor/github.com/prometheus/procfs/sysfs/net_class_test.go

@@ -0,0 +1,67 @@
+// Copyright 2018 The Prometheus Authors
+// 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.
+
+package sysfs
+
+import (
+	"reflect"
+	"testing"
+)
+
+func TestNewNetClass(t *testing.T) {
+	fs, err := NewFS("fixtures")
+	if err != nil {
+		t.Fatal(err)
+	}
+
+	nc, err := fs.NewNetClass()
+	if err != nil {
+		t.Fatal(err)
+	}
+
+	netClass := NetClass{
+		"eth0": {
+			Address:          "01:01:01:01:01:01",
+			AddrAssignType:   3,
+			AddrLen:          6,
+			Broadcast:        "ff:ff:ff:ff:ff:ff",
+			Carrier:          1,
+			CarrierChanges:   2,
+			CarrierDownCount: 1,
+			CarrierUpCount:   1,
+			DevID:            32,
+			Dormant:          1,
+			Duplex:           "full",
+			Flags:            4867,
+			IfAlias:          "",
+			IfIndex:          2,
+			IfLink:           2,
+			LinkMode:         1,
+			MTU:              1500,
+			Name:             "eth0",
+			NameAssignType:   2,
+			NetDevGroup:      0,
+			OperState:        "up",
+			PhysPortID:       "",
+			PhysPortName:     "",
+			PhysSwitchID:     "",
+			Speed:            1000,
+			TxQueueLen:       1000,
+			Type:             1,
+		},
+	}
+
+	if !reflect.DeepEqual(netClass, nc) {
+		t.Errorf("Result not correct: want %v, have %v", netClass, nc)
+	}
+}