RFR: 8303832: Use enhanced-for cycle instead of Enumeration in JceKeyStore

[Weijun Wang]

On Wed, 8 Mar 2023 19:10:11 GMT, Andrey Turbanov <aturbanov at openjdk.org> wrote:

> java.util.Enumeration is a legacy interface from java 1.0.
> There is couple of places with cycles which use it to iterate over collections. We can replace this manual cycle with enchanced-for, which is shorter and easier to read.

`Enumeration` is legacy because `Hashtable` behind it is legacy. But is it worth modifying `Hashtable` to `ConcurrentHashMap`? IMHO no.

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PR: https://git.openjdk.org/jdk/pull/12930