New block volume e2e tests

[dkoshkin]

Is this a bug fix or adding new feature?
Fixes #221

What is this PR about? / Why do we need it?
Add 2 new e2e tests that provisions block volumes.

• a single pod with 1 block volume
• a single pod with 1 block volume and 1 filesystem volume

What testing is done?
Locally ran the e2e tests:

• [SLOW TEST:58.178 seconds]
[ebs-csi-e2e] [single-az] Dynamic Provisioning
/Users/dkoshkin/src/github.com/kubernetes-sigs/aws-ebs-csi-driver/tests/e2e/dynamic_provisioning.go:35
  should create a raw block volume on demand
  /Users/dkoshkin/src/github.com/kubernetes-sigs/aws-ebs-csi-driver/tests/e2e/dynamic_provisioning.go:204
------------------------------
SSSSSSSSSS
Ran 1 of 32 Specs in 58.178 seconds
SUCCESS! -- 1 Passed | 0 Failed | 0 Pending | 31 Skipped
PASS

Ginkgo ran 1 suite in 1m6.767981631s
Test Suite Passed

• [SLOW TEST:90.392 seconds]
[ebs-csi-e2e] [single-az] Dynamic Provisioning
/Users/dkoshkin/src/github.com/kubernetes-sigs/aws-ebs-csi-driver/tests/e2e/dynamic_provisioning.go:35
  should create a raw block volume and a filesystem volume on demand and bind to the same pod
  /Users/dkoshkin/src/github.com/kubernetes-sigs/aws-ebs-csi-driver/tests/e2e/dynamic_provisioning.go:228
------------------------------
SSSSSSSSSSSSSSSSSSSSSSSSS
Ran 1 of 32 Specs in 90.393 seconds
SUCCESS! -- 1 Passed | 0 Failed | 0 Pending | 31 Skipped
PASS

Ginkgo ran 1 suite in 1m38.738854833s
Test Suite Passed

[coveralls]

Pull Request Test Coverage Report for Build 481

• 0 of 0 changed or added relevant lines in 0 files are covered.
• No unchanged relevant lines lost coverage.
• Overall coverage remained the same at 67.773%

---

Totals
Change from base Build 478:	0.0%
Covered Lines:	980
Relevant Lines:	1446

---

💛 - Coveralls

[dkoshkin]

@leakingtapan

Feb 26 12:45:19.343: INFO: At 2019-02-26 12:29:58 +0000 UTC - event for ebs-volume-tester-qh88n: {kubelet ip-172-20-56-1.us-west-2.compute.internal} FailedMapVolume: MapVolume.NewBlockVolumeMapper initialization failed for volume "pvc-116b60af-39c2-11e9-b1c6-021d115ece96" : CSIBlockVolume feature not enabled

Looks like the required feature gate is not setup in the test clusters CSIBlockVolume

Added it as part of this PR.

[leakingtapan]

/lgtm

@dkoshkin did you get a chance to verify the behavior of dd in busybox? will it return success even when the output file is not existing or not writable?

[dkoshkin]

@leakingtapan yes.

➜  ~ k exec -it ebs-volume-tester-7xpc7 -n e2e-tests-ebs-q64xt sh
/ # dd if=/dev/zero of=/dev/xvda bs=1024k count=100
100+0 records in
100+0 records out
104857600 bytes (100.0MB) copied, 0.037041 seconds, 2.6GB/s
/ # echo $?
0
/ # dd if=/dev/zero of=/dev/xvdb bs=1024k count=100
dd: writing '/dev/xvdb': No space left on device
65+0 records in
64+0 records out
67108864 bytes (64.0MB) copied, 0.028264 seconds, 2.2GB/s
/ # echo $?
1

[leakingtapan]

Thx for confirming

/approve

[k8s-ci-robot]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: dkoshkin, leakingtapan

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