### _Why are the changes needed?_
The current etcd docker image supports x86 only, so travis fail consistently.
https://hub.docker.com/layers/etcd/pachyderm/etcd/v3.5.2/images/sha256-48c43c7cb17b4a997490508d0ffcc7d3300f7fbbe07b899d6df37f9671dbcb63?context=explore
### _How was this patch tested?_
- [ ] Add some test cases that check the changes thoroughly including negative and positive cases if possible
- [x] Add screenshots for manual tests if appropriate
Test passed on arm64 platform
```
➜ incubator-kyuubi git:(PR_3148) build/mvn clean install -Dtest=none -DwildcardSuites=org.apache.kyuubi.ha.client.etcd.EtcdDiscoveryClientSuite -pl :kyuubi-ha_2.12 -am
```
```
[INFO] --- scalatest-maven-plugin:2.0.2:test (test) kyuubi-ha_2.12 ---
Discovery starting.
Discovery completed in 1 second, 902 milliseconds.
Run starting. Expected test count is: 4
EtcdDiscoveryClientSuite:
- publish instance to embedded zookeeper server
- KYUUBI-304: Stop engine service gracefully when related zk node is deleted
- parse host and port from instance string
- etcd test: set, get and delete
Run completed in 1 minute, 7 seconds.
Total number of tests run: 4
Suites: completed 2, aborted 0
Tests: succeeded 4, failed 0, canceled 0, ignored 0, pending 0
All tests passed.
```
- [x] [Run test](https://kyuubi.apache.org/docs/latest/develop_tools/testing.html#running-tests) locally before make a pull request
Closes#3148 from pan3793/etcd.
Closes#3148
17eaa8fc [Cheng Pan] nit
834a80e3 [Cheng Pan] nit
afb40915 [Cheng Pan] Change etcd docker image to recover arm64 CI
Authored-by: Cheng Pan <chengpan@apache.org>
Signed-off-by: Cheng Pan <chengpan@apache.org>
137e818ccb