add github.com/pkg/errors to glide and vendor

This adds github.com/pkg/errors to glide.yaml followed
by glide and glide-vc commands. The github.com/pkg/errors
package is currently required mainly for the errors.Wrap()
and errors.New() methods, since this lets us to annotate the
errors while passing the error message up the call stack.

vendor/github.com/spf13/pflag/uint_slice.go

@@ -1,126 +0,0 @@
-package pflag
-
-import (
-	"fmt"
-	"strconv"
-	"strings"
-)
-
-// -- uintSlice Value
-type uintSliceValue struct {
-	value   *[]uint
-	changed bool
-}
-
-func newUintSliceValue(val []uint, p *[]uint) *uintSliceValue {
-	uisv := new(uintSliceValue)
-	uisv.value = p
-	*uisv.value = val
-	return uisv
-}
-
-func (s *uintSliceValue) Set(val string) error {
-	ss := strings.Split(val, ",")
-	out := make([]uint, len(ss))
-	for i, d := range ss {
-		u, err := strconv.ParseUint(d, 10, 0)
-		if err != nil {
-			return err
-		}
-		out[i] = uint(u)
-	}
-	if !s.changed {
-		*s.value = out
-	} else {
-		*s.value = append(*s.value, out...)
-	}
-	s.changed = true
-	return nil
-}
-
-func (s *uintSliceValue) Type() string {
-	return "uintSlice"
-}
-
-func (s *uintSliceValue) String() string {
-	out := make([]string, len(*s.value))
-	for i, d := range *s.value {
-		out[i] = fmt.Sprintf("%d", d)
-	}
-	return "[" + strings.Join(out, ",") + "]"
-}
-
-func uintSliceConv(val string) (interface{}, error) {
-	val = strings.Trim(val, "[]")
-	// Empty string would cause a slice with one (empty) entry
-	if len(val) == 0 {
-		return []uint{}, nil
-	}
-	ss := strings.Split(val, ",")
-	out := make([]uint, len(ss))
-	for i, d := range ss {
-		u, err := strconv.ParseUint(d, 10, 0)
-		if err != nil {
-			return nil, err
-		}
-		out[i] = uint(u)
-	}
-	return out, nil
-}
-
-// GetUintSlice returns the []uint value of a flag with the given name.
-func (f *FlagSet) GetUintSlice(name string) ([]uint, error) {
-	val, err := f.getFlagType(name, "uintSlice", uintSliceConv)
-	if err != nil {
-		return []uint{}, err
-	}
-	return val.([]uint), nil
-}
-
-// UintSliceVar defines a uintSlice flag with specified name, default value, and usage string.
-// The argument p points to a []uint variable in which to store the value of the flag.
-func (f *FlagSet) UintSliceVar(p *[]uint, name string, value []uint, usage string) {
-	f.VarP(newUintSliceValue(value, p), name, "", usage)
-}
-
-// UintSliceVarP is like UintSliceVar, but accepts a shorthand letter that can be used after a single dash.
-func (f *FlagSet) UintSliceVarP(p *[]uint, name, shorthand string, value []uint, usage string) {
-	f.VarP(newUintSliceValue(value, p), name, shorthand, usage)
-}
-
-// UintSliceVar defines a uint[] flag with specified name, default value, and usage string.
-// The argument p points to a uint[] variable in which to store the value of the flag.
-func UintSliceVar(p *[]uint, name string, value []uint, usage string) {
-	CommandLine.VarP(newUintSliceValue(value, p), name, "", usage)
-}
-
-// UintSliceVarP is like the UintSliceVar, but accepts a shorthand letter that can be used after a single dash.
-func UintSliceVarP(p *[]uint, name, shorthand string, value []uint, usage string) {
-	CommandLine.VarP(newUintSliceValue(value, p), name, shorthand, usage)
-}
-
-// UintSlice defines a []uint flag with specified name, default value, and usage string.
-// The return value is the address of a []uint variable that stores the value of the flag.
-func (f *FlagSet) UintSlice(name string, value []uint, usage string) *[]uint {
-	p := []uint{}
-	f.UintSliceVarP(&p, name, "", value, usage)
-	return &p
-}
-
-// UintSliceP is like UintSlice, but accepts a shorthand letter that can be used after a single dash.
-func (f *FlagSet) UintSliceP(name, shorthand string, value []uint, usage string) *[]uint {
-	p := []uint{}
-	f.UintSliceVarP(&p, name, shorthand, value, usage)
-	return &p
-}
-
-// UintSlice defines a []uint flag with specified name, default value, and usage string.
-// The return value is the address of a []uint variable that stores the value of the flag.
-func UintSlice(name string, value []uint, usage string) *[]uint {
-	return CommandLine.UintSliceP(name, "", value, usage)
-}
-
-// UintSliceP is like UintSlice, but accepts a shorthand letter that can be used after a single dash.
-func UintSliceP(name, shorthand string, value []uint, usage string) *[]uint {
-	return CommandLine.UintSliceP(name, shorthand, value, usage)
-}