…cation) and NetUtils.isInvalidLocalHost(String)
## What is the purpose of the change
* Reduce object allocation.
* Reduce CPU operations.
## Brief changelog
* Reduce `Map$Node` and `Map$Node[]` allocation in `ContextFilter`.
* Reduce `RpcContext.getContext()` invoke times in `ContextFilter`.
* Use `host.startWith("127.")` instead of
`LOCAL_IP_PATTERN.matcher(host).matches()` in
`NetUtils.isInvalidLocalHost(String)`.
## Verifying this change
XXXXX
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what the pull request does, how, and why.
- [x] Write necessary unit-test to verify your logic correction, more mock a
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[ Full content available at: https://github.com/apache/dubbo/pull/5542 ]
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