List of strategic merge patches

[hyww]

Support multiple strategic merge patches in a List like this.

Then we can put same patch with different targets in a List and reuse duplicated parts using anchor/reference of YAML.

[Liujingfang1]

Can you add some tests?

[hyww]

@Liujingfang1 Sure. I have added some.

[Liujingfang1]

Thank you for working on this. I'm thinking that the issue in #581 could be solve as well by moving the change to a better location. See my following comments.

[Liujingfang1]

Add a test to cover the usage in #638

[hyww]

I added one in pkg/resource/factory_test.go

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[Liujingfang1]

/lgtm

Can you add a test for reading resources from a List in a follow up PR? Then we can mark #581 as fixed. Thank you.

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