Fix the error of hostAliases when there are more than 2 hostnames

[cdmikechen]

If there are more than 2 hostnames in hostAliases path, spec/hostAliases will only show the first and many last hostname. Like this:

hostAliases:
- ip: "10.1.1.1"
  hostnames:
  - "hostname1"
- ip: "10.1.1.3"
  hostnames:
  - "hostname3"
- ip: "10.1.1.3"
  hostnames:
  - "hostname3"

Now fix this problem.

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[cdmikechen]

@googlebot I signed it!

[liyinan926]

If the pod already has some host alias, we should use /spec/hostAliases/- for the path.

[google-cla]

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[cdmikechen]

@googlebot I fixed it.

[google-cla]

We found a Contributor License Agreement for you (the sender of this pull request), but were unable to find agreements for all the commit author(s) or Co-authors. If you authored these, maybe you used a different email address in the git commits than was used to sign the CLA (login here to double check)? If these were authored by someone else, then they will need to sign a CLA as well, and confirm that they're okay with these being contributed to Google.
In order to pass this check, please resolve this problem and then comment @googlebot I fixed it.. If the bot doesn't comment, it means it doesn't think anything has changed.

ℹ️ Googlers: Go here for more info.

[google-cla]

We found a Contributor License Agreement for you (the sender of this pull request), but were unable to find agreements for all the commit author(s) or Co-authors. If you authored these, maybe you used a different email address in the git commits than was used to sign the CLA (login here to double check)? If these were authored by someone else, then they will need to sign a CLA as well, and confirm that they're okay with these being contributed to Google.
In order to pass this check, please resolve this problem and then comment @googlebot I fixed it.. If the bot doesn't comment, it means it doesn't think anything has changed.

ℹ️ Googlers: Go here for more info.

[cdmikechen]

@liyinan926 Hi~ Thanks for your review.
I've changed my code, and run test in my computer. But I've seen CI build failed. Can you help me find the cause of the specific error, please ? I haven't found the connection between my code and the CI build failed.

[cdmikechen]

@liyinan926 Hi~ CI have passed by PR #1210
I've merge this change to codes.

[liyinan926]

LGTM