Need to change javadocs target in osbuild.xml to support an alternate sourcepath than just ${src.java} so quartz build can include its oracle/jboss/weblogic subprojects.

To do this, introduce property "javadoc.sourcepath" which will be passed to the javadoc task's sourcepath attribute and will default to ${src.java} to maintain backwards compatibility.

The Quartz build.xml will then override the property "javadoc.sourcepath" to conditionally include the src for the oracle/jboss/weblogic subprojects like so:

<pathconvert property="javadoc.sourcepath">
        <path>
            <dirset dir="${src}">
                <patternset>
                    <include name="java"/>
                    <include name="oracle" if="oracle.present"/>
                    <include name="weblogic" if="weblogic.present"/>
                    <include name="jboss" if="jboss.present"/>
                </patternset>
            </dirset>
        </path>
    </pathconvert>