Remove multierror package

Signed-off-by: Monis Khan <mok@vmware.com>

internal/multierror/multierror.go

@@ -1,63 +0,0 @@
-// Copyright 2020 the Pinniped contributors. All Rights Reserved.
-// SPDX-License-Identifier: Apache-2.0
-
-// Package multierror provides a type that can translate multiple errors into a Go error interface.
-//
-// A common use of this package is as follows.
-//   errs := multierror.New()
-//   for i := range stuff {
-//     err := doThing(i)
-//     errs.Add(err)
-//   }
-//   return errs.ErrOrNil()
-package multierror
-
-import (
-	"fmt"
-	"strings"
-)
-
-// formatFunc is a function used to format the string representing of a MultiError. It is used in the
-// Error() function.
-//
-// It is marked out here to indicate how we could potentially extend MultiError in the future to
-// support more styles of converting from a list of error's to a string.
-//nolint: gochecknoglobals
-var formatFunc func(errs MultiError, sb *strings.Builder) = defaultFormat
-
-// MultiError holds a list of error's, that could potentially be empty.
-//
-// Use New() to create a MultiError.
-type MultiError []error
-
-// New returns an empty MultiError.
-func New() MultiError {
-	return make([]error, 0)
-}
-
-// Add adds an error to the MultiError. The provided err must not be nil.
-func (m *MultiError) Add(err error) {
-	*m = append(*m, err)
-}
-
-// Error implements the error.Error() interface method.
-func (m MultiError) Error() string {
-	sb := strings.Builder{}
-	formatFunc(m, &sb)
-	return sb.String()
-}
-
-// ErrOrNil returns either nil, if there are no errors in this MultiError, or an error, otherwise.
-func (m MultiError) ErrOrNil() error {
-	if len(m) > 0 {
-		return m
-	}
-	return nil
-}
-
-func defaultFormat(errs MultiError, sb *strings.Builder) {
-	_, _ = fmt.Fprintf(sb, "%d error(s):", len(errs))
-	for _, err := range errs {
-		_, _ = fmt.Fprintf(sb, "\n- %s", err.Error())
-	}
-}

internal/multierror/multierror_test.go

@@ -1,24 +0,0 @@
-// Copyright 2020 the Pinniped contributors. All Rights Reserved.
-// SPDX-License-Identifier: Apache-2.0
-
-package multierror
-
-import (
-	"errors"
-	"testing"
-
-	"github.com/stretchr/testify/require"
-)
-
-func TestMultierror(t *testing.T) {
-	errs := New()
-
-	require.Nil(t, errs.ErrOrNil())
-
-	errs.Add(errors.New("some error 1"))
-	require.EqualError(t, errs.ErrOrNil(), "1 error(s):\n- some error 1")
-
-	errs.Add(errors.New("some error 2"))
-	errs.Add(errors.New("some error 3"))
-	require.EqualError(t, errs.ErrOrNil(), "3 error(s):\n- some error 1\n- some error 2\n- some error 3")
-}