Bael-868 (#6959)

* Tests for BAEL-868 (RxKotlin)

* BAEL-868 fix warnings

* Fix the build (?)

* Fix the build

* #BAEL-868 move RxKotlin test from kotlin-libraries project to kotlin-libraries-2

kotlin-libraries/build.gradle

@@ -54,9 +54,8 @@ dependencies {
     testCompile group: 'org.jetbrains.spek', name: 'spek-subject-extension', version: '1.1.5'
     testCompile group: 'org.jetbrains.spek', name: 'spek-junit-platform-engine', version: '1.1.5'
     implementation 'com.beust:klaxon:3.0.1'
-    implementation 'io.reactivex.rxjava2:rxkotlin:2.3.0'
-
 }
+
 task runServer(type: JavaExec) {
     main = 'APIServer'
    classpath = sourceSets.main.runtimeClasspath