vendor: update all dependencies

* Update all dependencies
  * Remove all `[[constraint]]` from Gopkg.toml
  * Add in the minimum number of `[[override]]` to build
  * Remove go get of github.com/inconshreveable/mousetrap as it is vendored
  * Update docs with new policy on constraints

vendor/github.com/golang/protobuf/proto/discard_test.go

@@ -0,0 +1,170 @@
+// Go support for Protocol Buffers - Google's data interchange format
+//
+// Copyright 2017 The Go Authors.  All rights reserved.
+// https://github.com/golang/protobuf
+//
+// Redistribution and use in source and binary forms, with or without
+// modification, are permitted provided that the following conditions are
+// met:
+//
+//     * Redistributions of source code must retain the above copyright
+// notice, this list of conditions and the following disclaimer.
+//     * Redistributions in binary form must reproduce the above
+// copyright notice, this list of conditions and the following disclaimer
+// in the documentation and/or other materials provided with the
+// distribution.
+//     * Neither the name of Google Inc. nor the names of its
+// contributors may be used to endorse or promote products derived from
+// this software without specific prior written permission.
+//
+// THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+// "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
+// LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
+// A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
+// OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
+// SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
+// LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
+// DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
+// THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+// (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
+// OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+
+package proto_test
+
+import (
+	"testing"
+
+	"github.com/golang/protobuf/proto"
+
+	proto3pb "github.com/golang/protobuf/proto/proto3_proto"
+	pb "github.com/golang/protobuf/proto/test_proto"
+)
+
+func TestDiscardUnknown(t *testing.T) {
+	tests := []struct {
+		desc     string
+		in, want proto.Message
+	}{{
+		desc: "Nil",
+		in:   nil, want: nil, // Should not panic
+	}, {
+		desc: "NilPtr",
+		in:   (*proto3pb.Message)(nil), want: (*proto3pb.Message)(nil), // Should not panic
+	}, {
+		desc: "Nested",
+		in: &proto3pb.Message{
+			Name:             "Aaron",
+			Nested:           &proto3pb.Nested{Cute: true, XXX_unrecognized: []byte("blah")},
+			XXX_unrecognized: []byte("blah"),
+		},
+		want: &proto3pb.Message{
+			Name:   "Aaron",
+			Nested: &proto3pb.Nested{Cute: true},
+		},
+	}, {
+		desc: "Slice",
+		in: &proto3pb.Message{
+			Name: "Aaron",
+			Children: []*proto3pb.Message{
+				{Name: "Sarah", XXX_unrecognized: []byte("blah")},
+				{Name: "Abraham", XXX_unrecognized: []byte("blah")},
+			},
+			XXX_unrecognized: []byte("blah"),
+		},
+		want: &proto3pb.Message{
+			Name: "Aaron",
+			Children: []*proto3pb.Message{
+				{Name: "Sarah"},
+				{Name: "Abraham"},
+			},
+		},
+	}, {
+		desc: "OneOf",
+		in: &pb.Communique{
+			Union: &pb.Communique_Msg{&pb.Strings{
+				StringField:      proto.String("123"),
+				XXX_unrecognized: []byte("blah"),
+			}},
+			XXX_unrecognized: []byte("blah"),
+		},
+		want: &pb.Communique{
+			Union: &pb.Communique_Msg{&pb.Strings{StringField: proto.String("123")}},
+		},
+	}, {
+		desc: "Map",
+		in: &pb.MessageWithMap{MsgMapping: map[int64]*pb.FloatingPoint{
+			0x4002: &pb.FloatingPoint{
+				Exact:            proto.Bool(true),
+				XXX_unrecognized: []byte("blah"),
+			},
+		}},
+		want: &pb.MessageWithMap{MsgMapping: map[int64]*pb.FloatingPoint{
+			0x4002: &pb.FloatingPoint{Exact: proto.Bool(true)},
+		}},
+	}, {
+		desc: "Extension",
+		in: func() proto.Message {
+			m := &pb.MyMessage{
+				Count: proto.Int32(42),
+				Somegroup: &pb.MyMessage_SomeGroup{
+					GroupField:       proto.Int32(6),
+					XXX_unrecognized: []byte("blah"),
+				},
+				XXX_unrecognized: []byte("blah"),
+			}
+			proto.SetExtension(m, pb.E_Ext_More, &pb.Ext{
+				Data:             proto.String("extension"),
+				XXX_unrecognized: []byte("blah"),
+			})
+			return m
+		}(),
+		want: func() proto.Message {
+			m := &pb.MyMessage{
+				Count:     proto.Int32(42),
+				Somegroup: &pb.MyMessage_SomeGroup{GroupField: proto.Int32(6)},
+			}
+			proto.SetExtension(m, pb.E_Ext_More, &pb.Ext{Data: proto.String("extension")})
+			return m
+		}(),
+	}}
+
+	// Test the legacy code path.
+	for _, tt := range tests {
+		// Clone the input so that we don't alter the original.
+		in := tt.in
+		if in != nil {
+			in = proto.Clone(tt.in)
+		}
+
+		var m LegacyMessage
+		m.Message, _ = in.(*proto3pb.Message)
+		m.Communique, _ = in.(*pb.Communique)
+		m.MessageWithMap, _ = in.(*pb.MessageWithMap)
+		m.MyMessage, _ = in.(*pb.MyMessage)
+		proto.DiscardUnknown(&m)
+		if !proto.Equal(in, tt.want) {
+			t.Errorf("test %s/Legacy, expected unknown fields to be discarded\ngot  %v\nwant %v", tt.desc, in, tt.want)
+		}
+	}
+
+	for _, tt := range tests {
+		proto.DiscardUnknown(tt.in)
+		if !proto.Equal(tt.in, tt.want) {
+			t.Errorf("test %s, expected unknown fields to be discarded\ngot  %v\nwant %v", tt.desc, tt.in, tt.want)
+		}
+	}
+}
+
+// LegacyMessage is a proto.Message that has several nested messages.
+// This does not have the XXX_DiscardUnknown method and so forces DiscardUnknown
+// to use the legacy fallback logic.
+type LegacyMessage struct {
+	Message        *proto3pb.Message
+	Communique     *pb.Communique
+	MessageWithMap *pb.MessageWithMap
+	MyMessage      *pb.MyMessage
+}
+
+func (m *LegacyMessage) Reset()         { *m = LegacyMessage{} }
+func (m *LegacyMessage) String() string { return proto.CompactTextString(m) }
+func (*LegacyMessage) ProtoMessage()    {}