Remove obsolete testData in properties. Replace it with testKotlinVersion

HACKING.md

@@ -24,7 +24,7 @@ To run blackbox compiler tests from JVM Kotlin use (takes time):
 
 To update the blackbox compiler tests set TeamCity build number in `gradle.properties`:
 
-    testDataVersion=<build number>:id
+    testKotlinVersion=<build number>
 
 and run `./gradlew update_external_tests`
 

gradle.properties

@@ -18,7 +18,6 @@
 buildKotlinVersion=1.3.0-rc-6
 buildKotlinCompilerRepo=http://dl.bintray.com/kotlin/kotlin-dev
 remoteRoot=konan_tests
-testDataVersion=1226829:id
 kotlinCompilerRepo=http://dl.bintray.com/kotlin/kotlin-dev
 kotlinVersion=1.3.0-rc-46
 testKotlinVersion=1.3.0-rc-43