Add tools.jar to boot classpath only for java8

Author: Soroosh Sarabadani

operator-framework/pom.xml

@@ -16,7 +16,6 @@
     <packaging>jar</packaging>
 
     <properties>
-        <java.version>8</java.version>
         <maven.compiler.source>1.8</maven.compiler.source>
         <maven.compiler.target>1.8</maven.compiler.target>
     </properties>