Clean up usage of properties from other plugins

git-svn-id: https://svn.apache.org/repos/asf/maven/maven-1/plugins/trunk@112761 13f79535-47bb-0310-9956-ffa450edef68

developer-activity/plugin.properties

@@ -4,11 +4,8 @@
 # Activity log plugin.
 # -------------------------------------------------------------------
 
-maven.src.dir = ${basedir}/src
 maven.build.dir = ${basedir}/target
 
-maven.docs.dest = ${maven.build.dir}/docs
 maven.docs.outputencoding = ISO-8859-1
 
 maven.activitylog.range = 30
-maven.changelog.factory = org.apache.maven.cvslib.CvsChangeLogFactory