[jdk11u-dev] RFR: 8276141: XPathFactory set/getProperty method

[Goetz Lindenmaier]

I backport this for parity with 11.0.15-oracle.

I had to do two straight forward fixes:
XPathFactoryImpl Tag @LastModified is adapted in head but does not exist in 11.
XPathTest.java A larger hunk did not apply. Simple to patch by hand.

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Commit messages:
 - Fix white space
 - Backport b226ab99c872e791d3ed9fca015cf92847904c34

Changes: https://git.openjdk.java.net/jdk11u-dev/pull/828/files
 Webrev: https://webrevs.openjdk.java.net/?repo=jdk11u-dev&pr=828&range=00
  Issue: https://bugs.openjdk.java.net/browse/JDK-8276141
  Stats: 257 lines in 5 files changed: 247 ins; 3 del; 7 mod
  Patch: https://git.openjdk.java.net/jdk11u-dev/pull/828.diff
  Fetch: git fetch https://git.openjdk.java.net/jdk11u-dev pull/828/head:pull/828

PR: https://git.openjdk.java.net/jdk11u-dev/pull/828