Add snapshot and diff service

Remove rootfs service in place of snapshot service. Adds
diff service for extracting and creating diffs. Diff
creation is not yet implemented. This service allows
pulling or creating images without needing root access to
mount. Additionally in the future this will allow containerd
to ensure extractions happen safely in a chroot if needed.

Signed-off-by: Derek McGowan <derek@mcgstyle.net>

snapshot/storage/proto/record.pb.go

@@ -63,7 +63,7 @@ func (Kind) EnumDescriptor() ([]byte, []int) { return fileDescriptorRecord, []in
 type Snapshot struct {
 	ID       uint64 `protobuf:"varint,1,opt,name=id,proto3" json:"id,omitempty"`
 	Parent   string `protobuf:"bytes,2,opt,name=parent,proto3" json:"parent,omitempty"`
-	Kind     Kind   `protobuf:"varint,4,opt,name=kind,proto3,enum=containerd.v1.Kind" json:"kind,omitempty"`
+	Kind     Kind   `protobuf:"varint,4,opt,name=kind,proto3,enum=containerd.snapshot.v1.Kind" json:"kind,omitempty"`
 	Readonly bool   `protobuf:"varint,5,opt,name=readonly,proto3" json:"readonly,omitempty"`
 	// inodes stores the number inodes in use for the snapshot.
 	//
@@ -81,8 +81,8 @@ func (*Snapshot) ProtoMessage()               {}
 func (*Snapshot) Descriptor() ([]byte, []int) { return fileDescriptorRecord, []int{0} }
 
 func init() {
-	proto1.RegisterType((*Snapshot)(nil), "containerd.v1.Snapshot")
-	proto1.RegisterEnum("containerd.v1.Kind", Kind_name, Kind_value)
+	proto1.RegisterType((*Snapshot)(nil), "containerd.snapshot.v1.Snapshot")
+	proto1.RegisterEnum("containerd.snapshot.v1.Kind", Kind_name, Kind_value)
 }
 func (m *Snapshot) Marshal() (dAtA []byte, err error) {
 	size := m.Size()
@@ -511,26 +511,26 @@ func init() {
 }
 
 var fileDescriptorRecord = []byte{
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 }

snapshot/storage/proto/record.proto

@@ -1,6 +1,6 @@
 syntax = "proto3";
 
-package containerd.v1;
+package containerd.snapshot.v1;
 
 import "gogoproto/gogo.proto";