virtcontainers: Initial import

This is a virtcontainers 1.0.8 import into Kata Containers runtime.

virtcontainers is a Go library designed to manage hardware virtualized
pods and containers. It is the core Clear Containers framework and will
become the core Kata Containers framework, as discussed at
https://github.com/kata-containers/runtime/issues/33

Some more more pointers:

virtcontainers README, including some design and architecure notes:
https://github.com/containers/virtcontainers/blob/master/README.md

virtcontainers 1.0 API:
https://github.com/containers/virtcontainers/blob/master/documentation/api/1.0/api.md

Fixes #40

Signed-off-by: Samuel Ortiz <sameo@linux.intel.com>

virtcontainers/types.go

@@ -0,0 +1,35 @@
+// Copyright (c) 2017 Intel Corporation
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+//      http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+package virtcontainers
+
+// ContainerType defines a type of container.
+type ContainerType string
+
+// List different types of containers
+var (
+	PodContainer         ContainerType = "pod_container"
+	PodSandbox           ContainerType = "pod_sandbox"
+	UnknownContainerType ContainerType = "unknown_container_type"
+)
+
+// IsPod determines if the container type can be considered as a pod.
+// We can consider a pod in case we have a PodSandbox or a RegularContainer.
+func (cType ContainerType) IsPod() bool {
+	if cType == PodSandbox {
+		return true
+	}
+
+	return false
+}