Create java-8 backport of Jetty-12.x/EE8

[gregw]

Jetty version(s)
Jetty-12

Enhancement Description

Create a version of jetty-12/EE8 that will run on java-8

[olamy]

This would require jetty-core Java 8 compliant as well.

[sbordet]

@gregw are you suggesting maintaining separate branches for jetty-12.0.x-java8 and jetty-12.1.x-java8?

I thought you wanted to reduce the number of branches?

I also thought Java 8 was dead.

[joakime]

We open ourselves to unfixed CVEs in our 3rd party dependencies that belong to abandoned Java 8 branches of theirs.
This is not a great idea.