Merge snapshot to master branch

[leakingtapan]

Is this a bug fix or adding new feature?
merge snapshot to master branch and resolved conflict happened during merge

What is this PR about? / Why do we need it?
Ref

• Add snapshot examples #210
• Don't wait for the snapshot to be completed #209
• Add snapshots support #131

[k8s-ci-robot]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: leakingtapan

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• OWNERS [leakingtapan]

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[coveralls]

Pull Request Test Coverage Report for Build 454

• 116 of 205 (56.59%) changed or added relevant lines in 3 files are covered.
• No unchanged relevant lines lost coverage.
• Overall coverage decreased (-0.7%) to 63.74%

---

Changes Missing Coverage	Covered Lines	Changed/Added Lines	%
pkg/driver/controller.go	43	67	64.18%
pkg/cloud/cloud.go	73	100	73.0%
pkg/cloud/fakes.go	0	38	0.0%

Totals
Change from base Build 448:	-0.7%
Covered Lines:	893
Relevant Lines:	1401

---

💛 - Coveralls

[leakingtapan]

/test pull-aws-ebs-csi-driver-integration

[leakingtapan]

/cc @tsmetana

[k8s-ci-robot]

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[tsmetana]

/lgtm

[k8s-ci-robot]

@tsmetana: changing LGTM is restricted to assignees, and only kubernetes-sigs/aws-ebs-csi-driver repo collaborators may be assigned issues.

In response to this:

/lgtm

Instructions for interacting with me using PR comments are available here. If you have questions or suggestions related to my behavior, please file an issue against the kubernetes/test-infra repository.

[ddebroy]

/lgtm