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/gogovanity.pb.go

@@ -1,15 +1,6 @@
 // Code generated by protoc-gen-gogo. DO NOT EDIT.
 // source: gogovanity.proto
 
-/*
-	Package vanity is a generated protocol buffer package.
-
-	It is generated from these files:
-		gogovanity.proto
-
-	It has these top-level messages:
-		B
-*/
 package vanity
 
 import proto "github.com/gogo/protobuf/proto"
@@ -31,16 +22,46 @@ var _ = math.Inf
 const _ = proto.GoGoProtoPackageIsVersion2 // please upgrade the proto package
 
 type B struct {
-	String_          *string `protobuf:"bytes,1,opt,name=String" json:"String,omitempty"`
-	Int64            *int64  `protobuf:"varint,2,opt,name=Int64" json:"Int64,omitempty"`
-	Int32            *int32  `protobuf:"varint,3,opt,name=Int32,def=1234" json:"Int32,omitempty"`
-	XXX_unrecognized []byte  `json:"-"`
+	String_              *string  `protobuf:"bytes,1,opt,name=String" json:"String,omitempty"`
+	Int64                *int64   `protobuf:"varint,2,opt,name=Int64" json:"Int64,omitempty"`
+	Int32                *int32   `protobuf:"varint,3,opt,name=Int32,def=1234" json:"Int32,omitempty"`
+	XXX_NoUnkeyedLiteral struct{} `json:"-"`
+	XXX_unrecognized     []byte   `json:"-"`
+	XXX_sizecache        int32    `json:"-"`
 }
 
-func (m *B) Reset()                    { *m = B{} }
-func (m *B) String() string            { return proto.CompactTextString(m) }
-func (*B) ProtoMessage()               {}
-func (*B) Descriptor() ([]byte, []int) { return fileDescriptorGogovanity, []int{0} }
+func (m *B) Reset()         { *m = B{} }
+func (m *B) String() string { return proto.CompactTextString(m) }
+func (*B) ProtoMessage()    {}
+func (*B) Descriptor() ([]byte, []int) {
+	return fileDescriptor_gogovanity_77d0a6938d93e1f7, []int{0}
+}
+func (m *B) XXX_Unmarshal(b []byte) error {
+	return m.Unmarshal(b)
+}
+func (m *B) XXX_Marshal(b []byte, deterministic bool) ([]byte, error) {
+	if deterministic {
+		return xxx_messageInfo_B.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 *B) XXX_Merge(src proto.Message) {
+	xxx_messageInfo_B.Merge(dst, src)
+}
+func (m *B) XXX_Size() int {
+	return m.Size()
+}
+func (m *B) XXX_DiscardUnknown() {
+	xxx_messageInfo_B.DiscardUnknown(m)
+}
+
+var xxx_messageInfo_B proto.InternalMessageInfo
 
 const Default_B_Int32 int32 = 1234
 
@@ -115,6 +136,9 @@ func encodeVarintGogovanity(dAtA []byte, offset int, v uint64) int {
 	return offset + 1
 }
 func (m *B) Size() (n int) {
+	if m == nil {
+		return 0
+	}
 	var l int
 	_ = l
 	if m.String_ != nil {
@@ -372,9 +396,9 @@ var (
 	ErrIntOverflowGogovanity   = fmt.Errorf("proto: integer overflow")
 )
 
-func init() { proto.RegisterFile("gogovanity.proto", fileDescriptorGogovanity) }
+func init() { proto.RegisterFile("gogovanity.proto", fileDescriptor_gogovanity_77d0a6938d93e1f7) }
 
-var fileDescriptorGogovanity = []byte{
+var fileDescriptor_gogovanity_77d0a6938d93e1f7 = []byte{
 	// 157 bytes of a gzipped FileDescriptorProto
 	0x1f, 0x8b, 0x08, 0x00, 0x00, 0x00, 0x00, 0x00, 0x02, 0xff, 0xe2, 0x12, 0x48, 0xcf, 0x4f, 0xcf,
 	0x2f, 0x4b, 0xcc, 0xcb, 0x2c, 0xa9, 0xd4, 0x2b, 0x28, 0xca, 0x2f, 0xc9, 0x17, 0x62, 0x83, 0xf0,