[jdk17u-dev] RFR: 8341138: Rename jtreg property docker.support as container.support

[Goetz Lindenmaier]

I backport this to make later backports clean.

test/hotspot/jtreg/TEST.ROOT
test/jdk/TEST.ROOT
Resolved due to context.

test/hotspot/jtreg/containers/docker/TestJFREvents.java
Resolved due to context.

test/jdk/jdk/internal/platform/docker/TestGetFreeSwapSpaceSize.java
Resolved Copyright due to context.

test/jtreg-ext/requires/VMProps.java
Several larger resolves and additional edits needed.

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Commit messages:
 - backport 41ee582df8c65f2f26b21e46784cf0bc4ece0585

Changes: https://git.openjdk.org/jdk17u-dev/pull/3924/files
  Webrev: https://webrevs.openjdk.org/?repo=jdk17u-dev&pr=3924&range=00
  Issue: https://bugs.openjdk.org/browse/JDK-8341138
  Stats: 58 lines in 26 files changed: 6 ins; 0 del; 52 mod
  Patch: https://git.openjdk.org/jdk17u-dev/pull/3924.diff
  Fetch: git fetch https://git.openjdk.org/jdk17u-dev.git pull/3924/head:pull/3924

PR: https://git.openjdk.org/jdk17u-dev/pull/3924