RFR: 8298447: Unnecessary Vector usage in DocPrintJob implementations

[Andrey Turbanov]

There are 3 implementations of javax.print.DocPrintJob in the JDK (It seems they were copy-pasted from each other):
1. PSStreamPrintJob
2. UnixPrintJob
3. Win32PrintJob

They have Vector fields 'jobListeners', 'attrListeners', 'listenedAttributeSets', but they are always accessed only under synchronized(this) blocks. It means we can safely replace them with ArrayList.

BTW. 'attrListeners' and 'listenedAttributeSets' seems unused.

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Commit messages:
 - [PATCH] Unnecessary Vector usage in DocPrintJob implementations

Changes: https://git.openjdk.org/jdk/pull/11504/files
 Webrev: https://webrevs.openjdk.org/?repo=jdk&pr=11504&range=00
  Issue: https://bugs.openjdk.org/browse/JDK-8298447
  Stats: 24 lines in 3 files changed: 0 ins; 0 del; 24 mod
  Patch: https://git.openjdk.org/jdk/pull/11504.diff
  Fetch: git fetch https://git.openjdk.org/jdk pull/11504/head:pull/11504

PR: https://git.openjdk.org/jdk/pull/11504