[jdk8u] RFR: 8340552: Harden TzdbZoneRulesCompiler against missing zone names

[Dmitry Cherepanov]

Almost clean backport after path reshuffling except copyright year (updated manually). 

All relevant tests passed (java/text/Format java/util/TimeZone sun/util/calendar sun/util/resources).

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Commit messages:
 - Backport 1bc13a1c10a580f84f1b7686c95344ec2633f611

Changes: https://git.openjdk.org/jdk8u/pull/66/files
  Webrev: https://webrevs.openjdk.org/?repo=jdk8u&pr=66&range=00
  Issue: https://bugs.openjdk.org/browse/JDK-8340552
  Stats: 12 lines in 1 file changed: 8 ins; 0 del; 4 mod
  Patch: https://git.openjdk.org/jdk8u/pull/66.diff
  Fetch: git fetch https://git.openjdk.org/jdk8u.git pull/66/head:pull/66

PR: https://git.openjdk.org/jdk8u/pull/66