upgrade gopkg.in/ini.v1 (#8500)

ini released v1.48.0 and deprecated the ini.AllCapsUnderscore symbol, as
such, during the upgrade we migrated to using ini.SnackCase.

vendor/gopkg.in/ini.v1/ini.go

@@ -18,11 +18,6 @@
 package ini
 
 import (
-	"bytes"
-	"fmt"
-	"io"
-	"io/ioutil"
-	"os"
 	"regexp"
 	"runtime"
 )
@@ -31,12 +26,10 @@ const (
 	// DefaultSection is the name of default section. You can use this constant or the string literal.
 	// In most of cases, an empty string is all you need to access the section.
 	DefaultSection = "DEFAULT"
-	// Deprecated: Use "DefaultSection" instead.
-	DEFAULT_SECTION = DefaultSection
 
 	// Maximum allowed depth when recursively substituing variable names.
 	depthValues = 99
-	version     = "1.46.0"
+	version     = "1.48.0"
 )
 
 // Version returns current package version literal.
@@ -49,26 +42,23 @@ var (
 	// This variable will be changed to "\r\n" automatically on Windows at package init time.
 	LineBreak = "\n"
 
-	// DefaultFormatLeft places custom spaces on the left when PrettyFormat and PrettyEqual are both disabled.
-	DefaultFormatLeft = ""
-	// DefaultFormatRight places custom spaces on the right when PrettyFormat and PrettyEqual are both disabled.
-	DefaultFormatRight = ""
-
 	// Variable regexp pattern: %(variable)s
-	varPattern = regexp.MustCompile(`%\(([^\)]+)\)s`)
-
-	// PrettyFormat indicates whether to align "=" sign with spaces to produce pretty output
-	// or reduce all possible spaces for compact format.
-	PrettyFormat = true
-
-	// PrettyEqual places spaces around "=" sign even when PrettyFormat is false.
-	PrettyEqual = false
+	varPattern = regexp.MustCompile(`%\(([^)]+)\)s`)
 
 	// DefaultHeader explicitly writes default section header.
 	DefaultHeader = false
 
 	// PrettySection indicates whether to put a line between sections.
 	PrettySection = true
+	// PrettyFormat indicates whether to align "=" sign with spaces to produce pretty output
+	// or reduce all possible spaces for compact format.
+	PrettyFormat = true
+	// PrettyEqual places spaces around "=" sign even when PrettyFormat is false.
+	PrettyEqual = false
+	// DefaultFormatLeft places custom spaces on the left when PrettyFormat and PrettyEqual are both disabled.
+	DefaultFormatLeft = ""
+	// DefaultFormatRight places custom spaces on the right when PrettyFormat and PrettyEqual are both disabled.
+	DefaultFormatRight = ""
 )
 
 func init() {
@@ -77,60 +67,6 @@ func init() {
 	}
 }
 
-func inSlice(str string, s []string) bool {
-	for _, v := range s {
-		if str == v {
-			return true
-		}
-	}
-	return false
-}
-
-// dataSource is an interface that returns object which can be read and closed.
-type dataSource interface {
-	ReadCloser() (io.ReadCloser, error)
-}
-
-// sourceFile represents an object that contains content on the local file system.
-type sourceFile struct {
-	name string
-}
-
-func (s sourceFile) ReadCloser() (_ io.ReadCloser, err error) {
-	return os.Open(s.name)
-}
-
-// sourceData represents an object that contains content in memory.
-type sourceData struct {
-	data []byte
-}
-
-func (s *sourceData) ReadCloser() (io.ReadCloser, error) {
-	return ioutil.NopCloser(bytes.NewReader(s.data)), nil
-}
-
-// sourceReadCloser represents an input stream with Close method.
-type sourceReadCloser struct {
-	reader io.ReadCloser
-}
-
-func (s *sourceReadCloser) ReadCloser() (io.ReadCloser, error) {
-	return s.reader, nil
-}
-
-func parseDataSource(source interface{}) (dataSource, error) {
-	switch s := source.(type) {
-	case string:
-		return sourceFile{s}, nil
-	case []byte:
-		return &sourceData{s}, nil
-	case io.ReadCloser:
-		return &sourceReadCloser{s}, nil
-	default:
-		return nil, fmt.Errorf("error parsing data source: unknown type '%s'", s)
-	}
-}
-
 // LoadOptions contains all customized options used for load data source(s).
 type LoadOptions struct {
 	// Loose indicates whether the parser should ignore nonexistent files or return error.