Minor, rework groovyTraitsWithFields integration test

Declaring Groovy and Kotlin classes in the same project is not necessary
for this test, split them to two projects instead to avoid the hack with
modifying task dependencies manually

libraries/tools/kotlin-gradle-plugin-integration-tests/src/test/resources/testProject/groovyTraitsWithFields/build.gradle

@@ -9,7 +9,6 @@ buildscript {
 }
 
 apply plugin: "kotlin"
-apply plugin: "groovy"
 apply plugin: "java"
 
 repositories {
@@ -19,14 +18,7 @@ repositories {
 
 dependencies {
     compile "org.jetbrains.kotlin:kotlin-stdlib:$kotlin_version"
-    compile 'org.codehaus.groovy:groovy-all:2.5.3'
-}
-
-compileGroovy.dependsOn = compileGroovy.taskDependencies.values - 'compileJava'
-
-compileKotlin {
-    dependsOn compileGroovy
-    classpath += files(compileGroovy.destinationDir)
+    compile project(":lib")
 }
 
 compileKotlin {

libraries/tools/kotlin-gradle-plugin-integration-tests/src/test/resources/testProject/groovyTraitsWithFields/lib/build.gradle

@@ -0,0 +1,9 @@
+apply plugin: "groovy"
+
+repositories {
+    mavenCentral()
+}
+
+dependencies {
+    compile 'org.codehaus.groovy:groovy-all:2.5.3'
+}

libraries/tools/kotlin-gradle-plugin-integration-tests/src/test/resources/testProject/groovyTraitsWithFields/settings.gradle

@@ -0,0 +1 @@
+include ":lib"