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/net_conntrackstat.go

@@ -1,153 +0,0 @@
-// Copyright 2020 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"
-	"io"
-	"strconv"
-	"strings"
-
-	"github.com/prometheus/procfs/internal/util"
-)
-
-// A ConntrackStatEntry represents one line from net/stat/nf_conntrack
-// and contains netfilter conntrack statistics at one CPU core
-type ConntrackStatEntry struct {
-	Entries       uint64
-	Found         uint64
-	Invalid       uint64
-	Ignore        uint64
-	Insert        uint64
-	InsertFailed  uint64
-	Drop          uint64
-	EarlyDrop     uint64
-	SearchRestart uint64
-}
-
-// Retrieves netfilter's conntrack statistics, split by CPU cores
-func (fs FS) ConntrackStat() ([]ConntrackStatEntry, error) {
-	return readConntrackStat(fs.proc.Path("net", "stat", "nf_conntrack"))
-}
-
-// Parses a slice of ConntrackStatEntries from the given filepath
-func readConntrackStat(path string) ([]ConntrackStatEntry, error) {
-	// This file is small and can be read with one syscall.
-	b, err := util.ReadFileNoStat(path)
-	if err != nil {
-		// Do not wrap this error so the caller can detect os.IsNotExist and
-		// similar conditions.
-		return nil, err
-	}
-
-	stat, err := parseConntrackStat(bytes.NewReader(b))
-	if err != nil {
-		return nil, fmt.Errorf("failed to read conntrack stats from %q: %v", path, err)
-	}
-
-	return stat, nil
-}
-
-// Reads the contents of a conntrack statistics file and parses a slice of ConntrackStatEntries
-func parseConntrackStat(r io.Reader) ([]ConntrackStatEntry, error) {
-	var entries []ConntrackStatEntry
-
-	scanner := bufio.NewScanner(r)
-	scanner.Scan()
-	for scanner.Scan() {
-		fields := strings.Fields(scanner.Text())
-		conntrackEntry, err := parseConntrackStatEntry(fields)
-		if err != nil {
-			return nil, err
-		}
-		entries = append(entries, *conntrackEntry)
-	}
-
-	return entries, nil
-}
-
-// Parses a ConntrackStatEntry from given array of fields
-func parseConntrackStatEntry(fields []string) (*ConntrackStatEntry, error) {
-	if len(fields) != 17 {
-		return nil, fmt.Errorf("invalid conntrackstat entry, missing fields")
-	}
-	entry := &ConntrackStatEntry{}
-
-	entries, err := parseConntrackStatField(fields[0])
-	if err != nil {
-		return nil, err
-	}
-	entry.Entries = entries
-
-	found, err := parseConntrackStatField(fields[2])
-	if err != nil {
-		return nil, err
-	}
-	entry.Found = found
-
-	invalid, err := parseConntrackStatField(fields[4])
-	if err != nil {
-		return nil, err
-	}
-	entry.Invalid = invalid
-
-	ignore, err := parseConntrackStatField(fields[5])
-	if err != nil {
-		return nil, err
-	}
-	entry.Ignore = ignore
-
-	insert, err := parseConntrackStatField(fields[8])
-	if err != nil {
-		return nil, err
-	}
-	entry.Insert = insert
-
-	insertFailed, err := parseConntrackStatField(fields[9])
-	if err != nil {
-		return nil, err
-	}
-	entry.InsertFailed = insertFailed
-
-	drop, err := parseConntrackStatField(fields[10])
-	if err != nil {
-		return nil, err
-	}
-	entry.Drop = drop
-
-	earlyDrop, err := parseConntrackStatField(fields[11])
-	if err != nil {
-		return nil, err
-	}
-	entry.EarlyDrop = earlyDrop
-
-	searchRestart, err := parseConntrackStatField(fields[16])
-	if err != nil {
-		return nil, err
-	}
-	entry.SearchRestart = searchRestart
-
-	return entry, nil
-}
-
-// Parses a uint64 from given hex in string
-func parseConntrackStatField(field string) (uint64, error) {
-	val, err := strconv.ParseUint(field, 16, 64)
-	if err != nil {
-		return 0, fmt.Errorf("couldn't parse \"%s\" field: %s", field, err)
-	}
-	return val, err
-}