8339803: Acknowledge case insensitive unambiguous keywords in tzdata files

[dimitryc]

Improves parsing of keywords in tzdata rules

• The patch from 11u doesn't apply cleanly due to JDK-8042369 missing in 8u. I backported new version of parseYear method (https://hg.openjdk.org/jdk9/jdk9/jdk/rev/6c26f18d9bc0#l8.347) with minor adaption to 8u codebase and then replaced uses of equals() with regionMatches()
• Minor conflict in copyright year in RuleRec.java, applied manually

Testing: all relevant tests passed (java/text/Format java/util/TimeZone sun/util/calendar sun/util/resources)

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Progress

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• JDK-8339803 needs maintainer approval

Issue

• JDK-8339803: Acknowledge case insensitive unambiguous keywords in tzdata files (Bug - P4)

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[openjdk]

This backport pull request has now been updated with issue from the original commit.

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