Add pause unpause test

[chuanchang]

vendor: update protocol
feature: add pause and unpause remote interface
hack: support pause and unpause feature
test: add testing for pause and unpause feature

Test Result

Running Suite: CRI validation
=============================
Random Seed: 1547802947 - Will randomize all specs
Will run 1 of 82 specs

SSSSSSSS
------------------------------
[k8s.io] Container runtime should support basic operations on container
  runtime should support pause running container [Conformance]
  /root/Workspace/go/src/github.com/kubernetes-sigs/cri-tools/pkg/validate/container.go:102
[BeforeEach] [k8s.io] Container
  /root/Workspace/go/src/github.com/kubernetes-sigs/cri-tools/pkg/framework/framework.go:51
[BeforeEach] [k8s.io] Container
  /root/Workspace/go/src/github.com/kubernetes-sigs/cri-tools/pkg/validate/container.go:65
[BeforeEach] runtime should support basic operations on container
  /root/Workspace/go/src/github.com/kubernetes-sigs/cri-tools/pkg/validate/container.go:74
[It] runtime should support pause running container [Conformance]
  /root/Workspace/go/src/github.com/kubernetes-sigs/cri-tools/pkg/validate/container.go:102
STEP: create container
STEP: Get image status for image: busybox:1.28
STEP: Create container.
Jan 18 17:15:47.946: INFO: Created container "c606fd9ac40db1ca0c3cf853e599e5e4cccbb8c135f27d48b57533734a81e6f2"

STEP: start container
STEP: Start container for containerID: c606fd9ac40db1ca0c3cf853e599e5e4cccbb8c135f27d48b57533734a81e6f2
Jan 18 17:15:48.067: INFO: Started container "c606fd9ac40db1ca0c3cf853e599e5e4cccbb8c135f27d48b57533734a81e6f2"

STEP: Get container status for containerID: c606fd9ac40db1ca0c3cf853e599e5e4cccbb8c135f27d48b57533734a81e6f2
Jan 18 17:15:48.068: INFO: the current state of container: CONTAINER_RUNNING
STEP: pause container
STEP: test pasue running container
STEP: Get container status for containerID: c606fd9ac40db1ca0c3cf853e599e5e4cccbb8c135f27d48b57533734a81e6f2
Jan 18 17:15:48.084: INFO: the state of container after pausing: CONTAINER_CREATED
STEP: unpause container
STEP: test recover pasued container
STEP: Get container status for containerID: c606fd9ac40db1ca0c3cf853e599e5e4cccbb8c135f27d48b57533734a81e6f2
Jan 18 17:15:48.100: INFO: the current state of container after unpausing: CONTAINER_RUNNING
STEP: test stop container
STEP: Stop container for containerID: c606fd9ac40db1ca0c3cf853e599e5e4cccbb8c135f27d48b57533734a81e6f2
Jan 18 17:15:48.218: INFO: Stopped container "c606fd9ac40db1ca0c3cf853e599e5e4cccbb8c135f27d48b57533734a81e6f2"

STEP: Get container status for containerID: c606fd9ac40db1ca0c3cf853e599e5e4cccbb8c135f27d48b57533734a81e6f2
[AfterEach] runtime should support basic operations on container
  /root/Workspace/go/src/github.com/kubernetes-sigs/cri-tools/pkg/validate/container.go:78
STEP: stop PodSandbox
STEP: delete PodSandbox
[AfterEach] [k8s.io] Container
  /root/Workspace/go/src/github.com/kubernetes-sigs/cri-tools/pkg/framework/framework.go:52
•SSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSS
Ran 1 of 82 Specs in 1.061 seconds
SUCCESS! -- 1 Passed | 0 Failed | 0 Pending | 81 Skipped PASS

[zhuangqh]

thanks @chuanchang merging...