RFR: 8253569: javax.xml.catalog.Catalog.matchURI() implementation should reset state variables [v2]

[Joe Wang]

> Resets state of a Catalog instance on each matching call so that it can be reused. Adjusts CatalogResolver's resolve routine so that it continues to observes the PREFER feature in a resolution process. Without the adjustment, PreferFeatureTest would fail.
> 
> Mach5 XML tests passed: https://mach5.us.oracle.com/mdash/jobs/huizwang-open-20220329-0148-30563542

Joe Wang has updated the pull request incrementally with one additional commit since the last revision:

  remove variable, check instance instead.

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Changes:
  - all: https://git.openjdk.java.net/jdk/pull/8018/files
  - new: https://git.openjdk.java.net/jdk/pull/8018/files/14513d7b..16bebbcf

Webrevs:
 - full: https://webrevs.openjdk.java.net/?repo=jdk&pr=8018&range=01
 - incr: https://webrevs.openjdk.java.net/?repo=jdk&pr=8018&range=00-01

  Stats: 6 lines in 2 files changed: 0 ins; 5 del; 1 mod
  Patch: https://git.openjdk.java.net/jdk/pull/8018.diff
  Fetch: git fetch https://git.openjdk.java.net/jdk pull/8018/head:pull/8018

PR: https://git.openjdk.java.net/jdk/pull/8018