[jdk17] RFR: JDK-8268826: Cleanup Override in Context-Specific Deserialization Filters

[Brent Christian]

On Wed, 16 Jun 2021 20:22:17 GMT, Roger Riggs <rriggs at openjdk.org> wrote:

> Remove the unnecessary special case "OVERRIDE" in jdk.serialFilterFactory property.
> Fix description in the example of a filter allowing platform classes.
> Suppress some warnings about use of SecurityManager in tests.

OVERRIDE is also mentioned in `src/java.base/share/conf/security/java.security b/src/java.base/share/conf/security/java.security`

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Changes requested by bchristi (Reviewer).

PR: https://git.openjdk.java.net/jdk17/pull/85