Pick up maven-javadoc-plugin version from parent POM

Author: garydgregory

pom.xml

@@ -214,7 +214,6 @@
     <commons.encoding>utf-8</commons.encoding>
     <commons.checkstyle-plugin.version>3.2.0</commons.checkstyle-plugin.version>
     <commons.checkstyle.impl.version>9.3</commons.checkstyle.impl.version>
-    <commons.javadoc.version>3.4.1</commons.javadoc.version>
     <commons.javadoc.java.link>${commons.javadoc7.java.link}</commons.javadoc.java.link>
     <commons.felix.version>5.1.2</commons.felix.version>
     <spotbugs.plugin.version>4.7.3.0</spotbugs.plugin.version>