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/vanity/test/fast/vanity.pb.go

@@ -1,21 +1,14 @@
 // Code generated by protoc-gen-gogo. DO NOT EDIT.
 // source: vanity.proto
 
-/*
-	Package vanity is a generated protocol buffer package.
-
-	It is generated from these files:
-		vanity.proto
-
-	It has these top-level messages:
-		A
-*/
 package vanity
 
 import proto "github.com/gogo/protobuf/proto"
 import fmt "fmt"
 import math "math"
 
+import github_com_gogo_protobuf_proto "github.com/gogo/protobuf/proto"
+
 import io "io"
 
 // Reference imports to suppress errors if they are not otherwise used.
@@ -30,15 +23,45 @@ var _ = math.Inf
 const _ = proto.GoGoProtoPackageIsVersion2 // please upgrade the proto package
 
 type A struct {
-	Strings          *string `protobuf:"bytes,1,opt,name=Strings" json:"Strings,omitempty"`
-	Int              *int64  `protobuf:"varint,2,req,name=Int" json:"Int,omitempty"`
-	XXX_unrecognized []byte  `json:"-"`
+	Strings              *string  `protobuf:"bytes,1,opt,name=Strings" json:"Strings,omitempty"`
+	Int                  *int64   `protobuf:"varint,2,req,name=Int" json:"Int,omitempty"`
+	XXX_NoUnkeyedLiteral struct{} `json:"-"`
+	XXX_unrecognized     []byte   `json:"-"`
+	XXX_sizecache        int32    `json:"-"`
 }
 
-func (m *A) Reset()                    { *m = A{} }
-func (m *A) String() string            { return proto.CompactTextString(m) }
-func (*A) ProtoMessage()               {}
-func (*A) Descriptor() ([]byte, []int) { return fileDescriptorVanity, []int{0} }
+func (m *A) Reset()         { *m = A{} }
+func (m *A) String() string { return proto.CompactTextString(m) }
+func (*A) ProtoMessage()    {}
+func (*A) Descriptor() ([]byte, []int) {
+	return fileDescriptor_vanity_62f5a5ee00b3fc23, []int{0}
+}
+func (m *A) XXX_Unmarshal(b []byte) error {
+	return m.Unmarshal(b)
+}
+func (m *A) XXX_Marshal(b []byte, deterministic bool) ([]byte, error) {
+	if deterministic {
+		return xxx_messageInfo_A.Marshal(b, m, deterministic)
+	} else {
+		b = b[:cap(b)]
+		n, err := m.MarshalTo(b)
+		if err != nil {
+			return nil, err
+		}
+		return b[:n], nil
+	}
+}
+func (dst *A) XXX_Merge(src proto.Message) {
+	xxx_messageInfo_A.Merge(dst, src)
+}
+func (m *A) XXX_Size() int {
+	return m.Size()
+}
+func (m *A) XXX_DiscardUnknown() {
+	xxx_messageInfo_A.DiscardUnknown(m)
+}
+
+var xxx_messageInfo_A proto.InternalMessageInfo
 
 func (m *A) GetStrings() string {
 	if m != nil && m.Strings != nil {
@@ -79,7 +102,7 @@ func (m *A) MarshalTo(dAtA []byte) (int, error) {
 		i += copy(dAtA[i:], *m.Strings)
 	}
 	if m.Int == nil {
-		return 0, proto.NewRequiredNotSetError("Int")
+		return 0, github_com_gogo_protobuf_proto.NewRequiredNotSetError("Int")
 	} else {
 		dAtA[i] = 0x10
 		i++
@@ -101,6 +124,9 @@ func encodeVarintVanity(dAtA []byte, offset int, v uint64) int {
 	return offset + 1
 }
 func (m *A) Size() (n int) {
+	if m == nil {
+		return 0
+	}
 	var l int
 	_ = l
 	if m.Strings != nil {
@@ -227,7 +253,7 @@ func (m *A) Unmarshal(dAtA []byte) error {
 		}
 	}
 	if hasFields[0]&uint64(0x00000001) == 0 {
-		return proto.NewRequiredNotSetError("Int")
+		return github_com_gogo_protobuf_proto.NewRequiredNotSetError("Int")
 	}
 
 	if iNdEx > l {
@@ -340,9 +366,9 @@ var (
 	ErrIntOverflowVanity   = fmt.Errorf("proto: integer overflow")
 )
 
-func init() { proto.RegisterFile("vanity.proto", fileDescriptorVanity) }
+func init() { proto.RegisterFile("vanity.proto", fileDescriptor_vanity_62f5a5ee00b3fc23) }
 
-var fileDescriptorVanity = []byte{
+var fileDescriptor_vanity_62f5a5ee00b3fc23 = []byte{
 	// 97 bytes of a gzipped FileDescriptorProto
 	0x1f, 0x8b, 0x08, 0x00, 0x00, 0x00, 0x00, 0x00, 0x02, 0xff, 0xe2, 0xe2, 0x29, 0x4b, 0xcc, 0xcb,
 	0x2c, 0xa9, 0xd4, 0x2b, 0x28, 0xca, 0x2f, 0xc9, 0x17, 0x62, 0x83, 0xf0, 0x94, 0xf4, 0xb9, 0x18,