RFR: CODETOOLS-7903304: Remove support for obsolete SCM systems

[Iris Clark]

On Wed, 14 Sep 2022 00:32:09 GMT, Jonathan Gibbons <jjg at openjdk.org> wrote:

> Please review a fairly simple update to remove support for very (very) old SCM systems, such as SCCS, TeamWare, RCS, CVS.
> 
> Mostly this consists of reducing the set of filenames to be ignored when scanning the file system.  
> The check for the SCCS artifact `@(#)` as "not a tag" is also removed.
> 
> One test is removed, which checked that files beginning with `,` were ignored. This was an SCCS artifact.

Marked as reviewed by iris (Reviewer).

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PR: https://git.openjdk.org/jtreg/pull/120