…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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