RFR: 8263556: remove `@modules java.base` from tests

[Igor Ignatyev]

Hi all,

could you please review this trivial cleanup?
from JBS:

> jtreg `@modules X` directive does two things: 
>  - exclude a test from execution if JDK under test doesn't have module X 
>  - if JDK under test has module X, make sure it's resolved 
> 
> both these things have no sense for `java.base` module as it's always available and is always resolved.


Thanks,
-- Igor

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Commit messages:
 - update copyright year
 - 8263556: remove `@modules java.base` from tests

Changes: https://git.openjdk.java.net/jdk/pull/2990/files
 Webrev: https://webrevs.openjdk.java.net/?repo=jdk&pr=2990&range=00
  Issue: https://bugs.openjdk.java.net/browse/JDK-8263556
  Stats: 21 lines in 13 files changed: 0 ins; 13 del; 8 mod
  Patch: https://git.openjdk.java.net/jdk/pull/2990.diff
  Fetch: git fetch https://git.openjdk.java.net/jdk pull/2990/head:pull/2990

PR: https://git.openjdk.java.net/jdk/pull/2990