all: Update protobuf package 1.0.0 -> 1.2.0 (#5452)

Also adds a few file global options to keep the generated code similar
to what we already had.

vendor/github.com/gogo/protobuf/protoc-gen-gogo/descriptor/descriptor_gostring.gen.go

@@ -1,43 +1,15 @@
 // Code generated by protoc-gen-gogo. DO NOT EDIT.
 // source: descriptor.proto
 
-/*
-Package descriptor is a generated protocol buffer package.
-
-It is generated from these files:
-	descriptor.proto
-
-It has these top-level messages:
-	FileDescriptorSet
-	FileDescriptorProto
-	DescriptorProto
-	ExtensionRangeOptions
-	FieldDescriptorProto
-	OneofDescriptorProto
-	EnumDescriptorProto
-	EnumValueDescriptorProto
-	ServiceDescriptorProto
-	MethodDescriptorProto
-	FileOptions
-	MessageOptions
-	FieldOptions
-	OneofOptions
-	EnumOptions
-	EnumValueOptions
-	ServiceOptions
-	MethodOptions
-	UninterpretedOption
-	SourceCodeInfo
-	GeneratedCodeInfo
-*/
 package descriptor
 
 import fmt "fmt"
 import strings "strings"
-import proto "github.com/gogo/protobuf/proto"
+import github_com_gogo_protobuf_proto "github.com/gogo/protobuf/proto"
 import sort "sort"
 import strconv "strconv"
 import reflect "reflect"
+import proto "github.com/gogo/protobuf/proto"
 import math "math"
 
 // Reference imports to suppress errors if they are not otherwise used.
@@ -752,8 +724,8 @@ func valueToGoStringDescriptor(v interface{}, typ string) string {
 	pv := reflect.Indirect(rv).Interface()
 	return fmt.Sprintf("func(v %v) *%v { return &v } ( %#v )", typ, typ, pv)
 }
-func extensionToGoStringDescriptor(m proto.Message) string {
-	e := proto.GetUnsafeExtensionsMap(m)
+func extensionToGoStringDescriptor(m github_com_gogo_protobuf_proto.Message) string {
+	e := github_com_gogo_protobuf_proto.GetUnsafeExtensionsMap(m)
 	if e == nil {
 		return "nil"
 	}