Better handling of intermediate CAs in datanode truststore #21062
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Description
This PR changes the way how we are adding certificates to the datanode truststore. So far we have added only the root(=selfsigned) CA, found at the end of the chain. Now we are adding the whole provided chain (in case it's valid). This allows usage of intermediate CAs for securing the datanode.
How Has This Been Tested?
Added unit tests, existing integration tests
Screenshots (if appropriate):
Types of changes
Checklist: