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/swaps.go

@@ -1,89 +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 (
-	"bufio"
-	"bytes"
-	"fmt"
-	"strconv"
-	"strings"
-
-	"github.com/prometheus/procfs/internal/util"
-)
-
-// Swap represents an entry in /proc/swaps.
-type Swap struct {
-	Filename string
-	Type     string
-	Size     int
-	Used     int
-	Priority int
-}
-
-// Swaps returns a slice of all configured swap devices on the system.
-func (fs FS) Swaps() ([]*Swap, error) {
-	data, err := util.ReadFileNoStat(fs.proc.Path("swaps"))
-	if err != nil {
-		return nil, err
-	}
-	return parseSwaps(data)
-}
-
-func parseSwaps(info []byte) ([]*Swap, error) {
-	swaps := []*Swap{}
-	scanner := bufio.NewScanner(bytes.NewReader(info))
-	scanner.Scan() // ignore header line
-	for scanner.Scan() {
-		swapString := scanner.Text()
-		parsedSwap, err := parseSwapString(swapString)
-		if err != nil {
-			return nil, err
-		}
-		swaps = append(swaps, parsedSwap)
-	}
-
-	err := scanner.Err()
-	return swaps, err
-}
-
-func parseSwapString(swapString string) (*Swap, error) {
-	var err error
-
-	swapFields := strings.Fields(swapString)
-	swapLength := len(swapFields)
-	if swapLength < 5 {
-		return nil, fmt.Errorf("too few fields in swap string: %s", swapString)
-	}
-
-	swap := &Swap{
-		Filename: swapFields[0],
-		Type:     swapFields[1],
-	}
-
-	swap.Size, err = strconv.Atoi(swapFields[2])
-	if err != nil {
-		return nil, fmt.Errorf("invalid swap size: %s", swapFields[2])
-	}
-	swap.Used, err = strconv.Atoi(swapFields[3])
-	if err != nil {
-		return nil, fmt.Errorf("invalid swap used: %s", swapFields[3])
-	}
-	swap.Priority, err = strconv.Atoi(swapFields[4])
-	if err != nil {
-		return nil, fmt.Errorf("invalid swap priority: %s", swapFields[4])
-	}
-
-	return swap, nil
-}