protobuf: remove generated google/rpc files

We move from having our own generated version of the googleapis files to
an upstream version that is present in gogo. As part of this, we update
the protobuf package to 1.0 and make some corrections for slight
differences in the generated code.

The impact of this change is very low.

Signed-off-by: Stephen J Day <stephen.day@docker.com>

vendor/github.com/gogo/protobuf/test/issue270/a/a1.proto

@@ -0,0 +1,12 @@
+syntax = "proto2";
+
+package issue270.a;
+
+import "github.com/gogo/protobuf/gogoproto/gogo.proto";
+import "github.com/gogo/protobuf/test/issue270/a/a2.proto";
+
+option (gogoproto.populate_all) = true;
+
+message A1 {
+    optional A2 a2 = 1;
+}

vendor/github.com/gogo/protobuf/test/issue270/a/a2.proto

@@ -0,0 +1,12 @@
+syntax = "proto2";
+
+package issue270.a;
+
+import "github.com/gogo/protobuf/gogoproto/gogo.proto";
+import "github.com/gogo/protobuf/test/issue270/b/b.proto";
+
+option (gogoproto.populate_all) = true;
+
+message A2 {
+    optional issue270.b.B b = 1;
+}

vendor/github.com/gogo/protobuf/test/issue270/b/b.proto

@@ -0,0 +1,6 @@
+syntax = "proto2";
+
+package issue270.b;
+
+message B {
+}