Do not hardcode kotlin version into maven plugin smoke test

libraries/tools/kotlin-maven-plugin/src/it/simple/pom.xml

@@ -26,7 +26,7 @@
             <plugin>
                 <groupId>org.jetbrains.kotlin</groupId>
                 <artifactId>kotlin-maven-plugin</artifactId>
-                <version>1.1-SNAPSHOT</version>
+                <version>${kotlin.version}</version>
 
                 <executions>
                     <execution>

libraries/tools/kotlin-maven-plugin/src/it/simple/verify.groovy

@@ -35,7 +35,7 @@ State state = new File(basedir, "build.log").readLines().collect { it.replaceAll
                 replaceAll(/[0-9]+\s*ms/, "LLL ms").
                 trim().
                 replaceAll(/^\[[A-Z]+\]$/, "").
-                replaceAll(/version [0-9a-z-+\.]+/, "version @snapshot@").
+                replace(kotlinVersion, "@snapshot@").
                 replaceAll(/\(JRE .+\)/, "(JRE <jre-version>)")
 
         if (filtered != "") {