RFR: 6944: build.sh does not correctly run UI tests due to not running p2 site

[Marcus Hirt]

On Wed, 21 Oct 2020 05:47:43 GMT, Patrick Reinhart <reinhapa at openjdk.org> wrote:

> - calculate BASEDIR only once
> - moved p2site (jetty) startup to separate method
> 
> Signed-off-by: Patrick Reinhart <patrick at reini.net>

Marked as reviewed by hirt (Lead).

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PR: https://git.openjdk.java.net/jmc/pull/136