Tasks implementing JavaForkOptions are instrumented without using -Pagent

[wilkinsona]

Describe the bug

The documentation states:

By default, if -Pagent is specified, all tasks that extend JavaForkOptions are instrumented.

Contrary to this, instrumentation happens without -Pagent.

To Reproduce
Steps to reproduce the behavior:

plugins {
	id 'java'
	id 'org.graalvm.buildtools.native' version '0.9.13'
}

$ gradle test
[native-image-plugin] Instrumenting task with the native-image-agent: test

Expected behavior
Tasks extending JavaForkOptions are only instrumented when specifying -Pagent.

System Info (please complete the following information):

• OS: N/A
• GraalVM Version: N/A
• Java Version: N/A
• Plugin version: 0.9.13

[melix]

This (confusing) message is already fixed. It says that tasks are instrumented, but they would be instrumented if -Pagent was used.

#278

[wilkinsona]

Thanks, @melix.