RFR: 8287544: Replace uses of StringBuffer with StringBuilder in java.naming

[Raffaello Giulietti]

On Sun, 29 May 2022 21:57:46 GMT, Andrey Turbanov <aturbanov at openjdk.org> wrote:

> StringBuffer is a legacy synchronized class. StringBuilder is a direct replacement to StringBuffer which generally have better performance.
> There are some code that still uses StringBuffer in java.naming which could be migrated to `StringBuilder`.

_not a reviewer_
LGTM

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PR: https://git.openjdk.java.net/jdk/pull/8942