Add etcd iochaos example

[yeya24]

Signed-off-by: yeya24 yb532204897@gmail.com

What problem does this PR solve?

Fixes #216.

Etcd can achieve the same purpose for iochaos testing and it is easier with the help of etcdctl.

Verification:

# with iochaos delay
# etcdctl check perf
 60 / 60 Boooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooo! 100.00% 1m0s
FAIL: Throughput too low: 79 writes/s
Slowest request took too long: 6.761501s
Stddev too high: 1.384703s
FAIL

# no iochaos
# etcdctl check perf
 60 / 60 Boooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooo! 100.00% 1m0s
PASS: Throughput is 150 writes/s
PASS: Slowest request took 0.029531s
PASS: Stddev is 0.001335s
PASS

cc @Yisaer

What is changed and how does it work?

Check List

Tests

• Unit test
• E2E test
• Manual test (add detailed scripts or steps below)
• No code

Code changes

• Has Go code change
• Has CI related scripts change
• Has Terraform scripts change

Side effects

• Breaking backward compatibility

Related changes

• Need to update the documentation

Does this PR introduce a user-facing change?:

NONE

[zhouqiang-cl]

LGTM

[zhouqiang-cl]

@cwen0 @Yisaer PTAL

[codecov-io]

Codecov Report

Merging #224 into master will increase coverage by 2.86%.
The diff coverage is n/a.

@@            Coverage Diff             @@
##           master     #224      +/-   ##
==========================================
+ Coverage   40.78%   43.64%   +2.86%     
==========================================
  Files          20       18       -2     
  Lines         738      685      -53     
==========================================
- Hits          301      299       -2     
+ Misses        404      353      -51     
  Partials       33       33

Impacted Files	Coverage Δ
controllers/timechaos_controller.go
api/v1alpha1/timechaos_types.go

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[Yisaer]

Good job! Thanks for your contribution. @yeya24