kotlin-gradle-plugin-integration-tests on runtime uses relocated
compiler jars. A special handling is required to support this.
Looks like 'kotlin-gradle-plugin-test-utils' was meant to help
here somehow, but was accidentally broken at some point. It went
unnoticed because not much classes from transitive dependencies
of 'kotlin-gradle-plugin-test-utils' were used.
The change in this commit still leaves a few questions about this
configuration, but at leats it makes it possible to use compiler
classes (e.g. KotlinTestUtils)
Dmitry Savvinov
0a33eef518