Drop outdated pb.txt files

Signed-off-by: Maksym Pavlenko <pavlenko.maksym@gmail.com>

api/Protobuild.toml

@@ -1,66 +0,0 @@
-version = "2"
-generators = ["go", "go-grpc", "go-ttrpc"]
-
-# Control protoc include paths. Below are usually some good defaults, but feel
-# free to try it without them if it works for your project.
-[includes]
-  # Include paths that will be added before all others. Typically, you want to
-  # treat the root of the project as an include, but this may not be necessary.
-  before = []
-
-  # Paths that will be added untouched to the end of the includes. We use
-  # `/usr/local/include` to pickup the common install location of protobuf.
-  # This is the default.
-  after = ["/usr/local/include"]
-
-# This section maps protobuf imports to Go packages. These will become
-# `-M` directives in the call to the go protobuf generator.
-[packages]
-  "google/rpc/status.proto" = "google.golang.org/genproto/googleapis/rpc/status"
-
-[parameters.go-ttrpc]
-prefix = "TTRPC"
-
-[[overrides]]
-prefixes = ["github.com/containerd/containerd/api/events"]
-generators = ["go", "go-ttrpc", "go-fieldpath"]
-
-[overrides.parameters.go-ttrpc]
-prefix = ""
-
-[[overrides]]
-prefixes = ["github.com/containerd/containerd/api/services/ttrpc/events/v1"]
-generators = ["go", "go-ttrpc"]
-
-[overrides.parameters.go-ttrpc]
-prefix = ""
-
-[[overrides]]
-# enable ttrpc and disable fieldpath and grpc for the shim
-prefixes = [
-  "github.com/containerd/containerd/api/runtime/task/v2",
-]
-generators = ["go", "go-ttrpc"]
-
-[overrides.parameters.go-ttrpc]
-prefix = ""
-
-[[overrides]]
-prefixes = [
-  "github.com/containerd/containerd/api/runtime/sandbox/v1",
-]
-generators = ["go", "go-ttrpc", "go-grpc"]
-
-[[overrides]]
-prefixes = [
-  "github.com/containerd/containerd/api/runtime/task/v3",
-]
-generators = ["go", "go-ttrpc", "go-grpc"]
-
-# Aggregrate the API descriptors to lock down API changes.
-[[descriptors]]
-prefix = "github.com/containerd/containerd/api"
-target = "next.pb.txt"
-ignore_files = [
-	"google/protobuf/descriptor.proto",
-]

api/README.md

@@ -1,18 +0,0 @@
-This directory contains the GRPC API definitions for containerd.
-
-All defined services and messages have been aggregated into `*.pb.txt`
-descriptors files in this directory. Definitions present here are considered
-frozen after the release.
-
-At release time, the current `next.pb.txt` file will be moved into place to
-freeze the API changes for the minor version. For example, when 1.0.0 is
-released, `next.pb.txt` should be moved to `1.0.txt`. Notice that we leave off
-the patch number, since the API will be completely locked down for a given
-patch series.
-
-We may find that by default, protobuf descriptors are too noisy to lock down
-API changes. In that case, we may filter out certain fields in the descriptors,
-possibly regenerating for old versions.
-
-This process is similar to the [process used to ensure backwards compatibility
-in Go](https://github.com/golang/go/tree/master/api).