RFR: 8274407: (tz) Update Timezone Data to 2021c

Wed Oct 6 03:17:27 UTC 2021

This PR is to upgrade the time zone data in the JDK to IANA's tzdata2021c level. Note that the tz data is "as is", as released by IANA. No `merged links` are retracted.
The PR also fixes two issues along with the 2021c upgrade.

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Commit messages:
 - Fix for Asia/Amman test case error
 - Test fix for Samoa not observing DST
 - tzdata2021c
 - 8274407: (tz) Update Timezone Data to 2021b

Changes: https://git.openjdk.java.net/jdk/pull/5832/files
 Webrev: https://webrevs.openjdk.java.net/?repo=jdk&pr=5832&range=00
  Issue: https://bugs.openjdk.java.net/browse/JDK-8274407
  Stats: 635 lines in 13 files changed: 228 ins; 329 del; 78 mod
  Patch: https://git.openjdk.java.net/jdk/pull/5832.diff
  Fetch: git fetch https://git.openjdk.java.net/jdk pull/5832/head:pull/5832

PR: https://git.openjdk.java.net/jdk/pull/5832