RFR: 8257450: Start of release updates for JDK 17

[Joe Darcy]

On Tue, 1 Dec 2020 07:38:13 GMT, David Holmes <dholmes at openjdk.org> wrote:

>> Start of JDK 17 updates.
>
> Looks good - 99% sym stuff :)
> 
> Doesn't look like the hotspot deprecated flag test will need updating this time, as no newly deprecated flags marked for obsoletion in 17.

Usual start of release update:

* Expected version number updates in the make system
* New set of data files to support --release 16 in javac
* Update to various version-related langtools APIs and tests
* Minor N -> N+1 updates in vm and vm tests

One javadoc test that failed under the new version was fixed before this PR was sent out.

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PR: https://git.openjdk.java.net/jdk/pull/1531