RFR: 6946: There should be an option to build the agent in the build script [v7]

[Miroslav Wengner]

On Thu, 17 Dec 2020 06:00:08 GMT, Patrick Reinhart <reinhapa at openjdk.org> wrote:

> Why was the Jetty start removed from the `--test` and `--package` option? In case of calling those tasks with not previously calling `--build` it will lead to errors as is did not before.
good question: as those option I've not modified, I see `runTests -> --test`(corrected) . there is no option `--package`, there is an option `--packageJmc` and it executes properly `startJetty` function

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PR: https://git.openjdk.java.net/jmc/pull/183