Remove gogo from .proto files

While gogo isn't actually used, it is still referenced from .proto files
and its corresponding Go package is imported from the auto-generated
files.

Signed-off-by: Kazuyoshi Kato <katokazu@amazon.com>

api/types/descriptor.proto

@@ -18,8 +18,6 @@ syntax = "proto3";
 
 package containerd.types;
 
-import "gogoproto/gogo.proto";
-
 option go_package = "github.com/containerd/containerd/api/types;types";
 
 // Descriptor describes a blob in a content store.

api/types/metrics.proto

@@ -18,7 +18,6 @@ syntax = "proto3";
 
 package containerd.types;
 
-import "gogoproto/gogo.proto";
 import "google/protobuf/any.proto";
 import "google/protobuf/timestamp.proto";
 

api/types/mount.proto

@@ -18,8 +18,6 @@ syntax = "proto3";
 
 package containerd.types;
 
-import "gogoproto/gogo.proto";
-
 option go_package = "github.com/containerd/containerd/api/types;types";
 
 // Mount describes mounts for a container.

api/types/platform.proto

@@ -18,8 +18,6 @@ syntax = "proto3";
 
 package containerd.types;
 
-import "gogoproto/gogo.proto";
-
 option go_package = "github.com/containerd/containerd/api/types;types";
 
 // Platform follows the structure of the OCI platform specification, from

api/types/sandbox.proto

@@ -18,7 +18,6 @@ syntax = "proto3";
 
 package containerd.types;
 
-import weak "gogoproto/gogo.proto";
 import "google/protobuf/any.proto";
 import "google/protobuf/timestamp.proto";
 

api/types/task/task.proto

@@ -18,7 +18,6 @@ syntax = "proto3";
 
 package containerd.v1.types;
 
-import "gogoproto/gogo.proto";
 import "google/protobuf/timestamp.proto";
 import "google/protobuf/any.proto";