See the previous commit for information on the kotlin-reflect vs
kotlin-reflect-api distinction.
Add kotlin-reflect as an explicit runtime dependency of most of the test
configurations because even though they all depend on tests-common, the
runtime dependency on kotlin-reflect is not exported from tests-common
to other modules because the projectTests dependency is not transitive.
`tests-jar` configuration now extends testRuntime instead of testCompile
(note that testRuntime extends testCompile),
and projectTests() dependency shortcut makes it transitive.
This is required to depend on test utility modules producing `-tests` jar instead of default one
without listing all their transitive dependencies.
Alexander Udalov