rebase: vendor dependencies for Vault API

Uses github.com/libopenstorage/secrets to communicate with Vault. This
removes the need for maintaining our own limited Vault APIs.

By adding the new dependency, several other packages got updated in the
process. Unused indirect dependencies have been removed from go.mod.

Signed-off-by: Niels de Vos <ndevos@redhat.com>

vendor/github.com/prometheus/procfs/loadavg.go

@@ -1,62 +0,0 @@
-// Copyright 2019 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 procfs
-
-import (
-	"fmt"
-	"strconv"
-	"strings"
-
-	"github.com/prometheus/procfs/internal/util"
-)
-
-// LoadAvg represents an entry in /proc/loadavg
-type LoadAvg struct {
-	Load1  float64
-	Load5  float64
-	Load15 float64
-}
-
-// LoadAvg returns loadavg from /proc.
-func (fs FS) LoadAvg() (*LoadAvg, error) {
-	path := fs.proc.Path("loadavg")
-
-	data, err := util.ReadFileNoStat(path)
-	if err != nil {
-		return nil, err
-	}
-	return parseLoad(data)
-}
-
-// Parse /proc loadavg and return 1m, 5m and 15m.
-func parseLoad(loadavgBytes []byte) (*LoadAvg, error) {
-	loads := make([]float64, 3)
-	parts := strings.Fields(string(loadavgBytes))
-	if len(parts) < 3 {
-		return nil, fmt.Errorf("malformed loadavg line: too few fields in loadavg string: %s", string(loadavgBytes))
-	}
-
-	var err error
-	for i, load := range parts[0:3] {
-		loads[i], err = strconv.ParseFloat(load, 64)
-		if err != nil {
-			return nil, fmt.Errorf("could not parse load '%s': %s", load, err)
-		}
-	}
-	return &LoadAvg{
-		Load1:  loads[0],
-		Load5:  loads[1],
-		Load15: loads[2],
-	}, nil
-}