RFR: 8297074: Use enhanced-for cycle instead of Enumeration in javax.crypto

[Andrey Turbanov]

java.util.Enumeration is a legacy interface from java 1.0.
There are a few 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.

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Commit messages:
 - 8297074: Use enhanced-for cycle instead of Enumeration in javax.crypto
 - [PATCH] Use enhanced-for cycle instead of Enumeration in javax.crypto
 - [PATCH] Use enhanced-for cycle instead of Enumeration in javax.crypto

Changes: https://git.openjdk.org/jdk/pull/11022/files
 Webrev: https://webrevs.openjdk.org/?repo=jdk&pr=11022&range=00
  Issue: https://bugs.openjdk.org/browse/JDK-8297074
  Stats: 36 lines in 3 files changed: 0 ins; 30 del; 6 mod
  Patch: https://git.openjdk.org/jdk/pull/11022.diff
  Fetch: git fetch https://git.openjdk.org/jdk pull/11022/head:pull/11022

PR: https://git.openjdk.org/jdk/pull/11022