Shade test jars from compiler used in Gradle tests

This fixes `VerifyError` for all integration tests calling
`KotlinTestUtils.findAndroidSdk()`.
The exception was thrown because `:kotlin-gradle-plugin-integration-tests`
was depending on both relocated intellij-core (from kotlin-compiler-embeddable)
and non-relocated intellij-core (transitevely through tests jars from compiler).

A call to `findAndroidSdk()` was triggering classloading
for `KotlinTestUtils` which had bytecode references to
`org.jetbrains.kotlin.idea.KotlinLanguage` loaded from the embeddable compiler
and to `com.intellij.lang.Language` loaded from non-relocated intellij-core.

`KotlinLanguage` from the embeddable compiler was a subclass of relocated
`org.jetbrains.kotlin.com.intellij.lang.Language` thus it was not
assignable to `com.intellij.lang.Language` causing `VerifyError`.

The solution is to create relocated jar combining the necessary test jars
from the compiler.

libraries/tools/kotlin-gradle-plugin-integration-tests/build.gradle

@@ -15,12 +15,12 @@ dependencies {
     testCompile project(':kotlin-test:kotlin-test-jvm')
 
     testCompile project(path: ':kotlin-compiler-embeddable', configuration: 'runtimeJar')
+    testCompile (project(path: ':kotlin-gradle-plugin-test-utils-embeddable', configuration: 'runtimeJar'))
+
     testCompile project(path: ':examples:annotation-processor-example')
     testCompile project(':kotlin-stdlib-jre8')
     testCompile project(':kotlin-reflect')
     testCompile project(':kotlin-android-extensions')
-    testCompile project(path: ':kotlin-build-common', configuration: 'tests-jar')
-    testCompile project(path: ':compiler:incremental-compilation-impl', configuration: 'tests-jar')
 
     testCompile gradleApi()
 

libraries/tools/kotlin-gradle-plugin-integration-tests/src/test/kotlin/org/jetbrains/kotlin/gradle/BaseGradleIT.kt

@@ -1,6 +1,6 @@
 package org.jetbrains.kotlin.gradle
 
-import com.intellij.openapi.util.io.FileUtil
+import org.jetbrains.kotlin.com.intellij.openapi.util.io.FileUtil
 import org.gradle.api.logging.LogLevel
 import org.jetbrains.kotlin.gradle.util.*
 import org.junit.After

libraries/tools/kotlin-gradle-plugin-integration-tests/src/test/kotlin/org/jetbrains/kotlin/gradle/KotlinGradlePluginIT.kt

@@ -17,7 +17,7 @@
 package org.jetbrains.kotlin.gradle
 
 import org.gradle.api.logging.LogLevel
-import com.intellij.openapi.util.io.FileUtil
+import org.jetbrains.kotlin.com.intellij.openapi.util.io.FileUtil
 import org.jetbrains.kotlin.gradle.plugin.CopyClassesToJavaOutputStatus
 import org.jetbrains.kotlin.gradle.tasks.USING_INCREMENTAL_COMPILATION_MESSAGE
 import org.jetbrains.kotlin.gradle.plugin.*