RFR: 8341138: Rename jtreg property docker.support as container.support

[Ramkumar Sunderbabu]

The System property "docker.support" defined in VMProps gives a wrong impression that it is tied to docker alone. The property is common for any container runtime. Hence, it needs to be renamed as "container.support".

Positive Testing:
tier1,tier2,tier3 - to check stability
tier5 - to run container tests

Negative Testing:
Ran the following groups in hosts where container is not present.
open/test/hotspot/jtreg/containers/
open/test/jdk/jdk/internal/platform/docker/
open/test/jdk/jdk/internal/platform/cgroup/

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Commit messages:
 - corrected the copyright headers
 - initial commit

Changes: https://git.openjdk.org/jdk/pull/21423/files
  Webrev: https://webrevs.openjdk.org/?repo=jdk&pr=21423&range=00
  Issue: https://bugs.openjdk.org/browse/JDK-8341138
  Stats: 54 lines in 26 files changed: 6 ins; 0 del; 48 mod
  Patch: https://git.openjdk.org/jdk/pull/21423.diff
  Fetch: git fetch https://git.openjdk.org/jdk.git pull/21423/head:pull/21423

PR: https://git.openjdk.org/jdk/pull/21423