Support early access java version

[eyalkoren]

What does this PR do?

Supports dashes in Java major version, eg 15-ea+34-1554.
Before this fix, the agent would through a NumberFormatException

Checklist

• This is an enhancement of existing features, or a new feature in existing plugins
  • I have updated CHANGELOG.asciidoc
  • I have added tests that prove my fix is effective or that my feature works
  • Added an API method or config option? Document in which version this will be introduced
  • I have made corresponding changes to the documentation
• This is a bugfix
  • I have updated CHANGELOG.asciidoc
  • I have added tests that would fail without this fix
• This is a new plugin
  • I have updated CHANGELOG.asciidoc
  • My code follows the style guidelines of this project
  • I have made corresponding changes to the documentation
  • I have added tests that prove my fix is effective or that my feature works
  • New and existing unit tests pass locally with my changes
  • I have updated supported-technologies.asciidoc
  • Added an API method or config option? Document in which version this will be introduced
  • Added an instrumentation plugin? Describe how you made sure that old, non-supported versions are not instrumented by accident.
• This is something else
  • I have updated CHANGELOG.asciidoc

[felixbarny]

contains unrelated changes, other than that LGTM

[ghost]

💚 Build Succeeded

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Build stats

• Build Cause: [Pull request #1325 updated]

• Start Time: 2020-08-04T13:58:55.494+0000

• Duration: 45 min 49 sec

Test stats 🧪

Test	Results
Failed	0
Passed	1435
Skipped	11
Total	1446

Steps errors

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• Name: Download Codecov

  • Description: #!/bin/bash set -x curl -sSLo codecov.sh https://codecov.io/bash

  • Duration: 2 min 22 sec

  • Start Time: 2020-08-04T14:41:13.993+0000

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