[jdk8u-dev] RFR: 8041523: Xerces Update: Serializer improvements from Xalan

[Ekaterina Vergizova]

I'd like to backport JDK-8041523 to 8u.
This backport fixes jck8 api/xinclude test failures that occur after JDK-8037259 backport to 8u.
Аffected tests:
api/xinclude/Nist/Nist-include-38.html#Nist-include-38
api/xinclude/Nist/Nist-include-37.html#Nist-include-37
api/xinclude/Harold/harold-64.html#harold-64

Original patch from jdk9 [894ae6562453](http://hg.openjdk.java.net/jdk9/jdk9/jaxp/rev/894ae6562453) applies almost cleanly except for some copyright differences and imports reshuffling.

Tested with jdk_tier1, jdk_other (that includes javax/xml) and jck8 api/xinclude.

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Commit messages:
 - Backport 38fdd0804030744b2804c35c97f843319a961799

Changes: https://git.openjdk.java.net/jdk8u-dev/pull/7/files
 Webrev: https://webrevs.openjdk.java.net/?repo=jdk8u-dev&pr=7&range=00
  Issue: https://bugs.openjdk.java.net/browse/JDK-8041523
  Stats: 1229 lines in 12 files changed: 721 ins; 346 del; 162 mod
  Patch: https://git.openjdk.java.net/jdk8u-dev/pull/7.diff
  Fetch: git fetch https://git.openjdk.java.net/jdk8u-dev pull/7/head:pull/7

PR: https://git.openjdk.java.net/jdk8u-dev/pull/7