Lifecycle stage is not honoured when only cluster level lifecycle is implemented.

<feed name="RetentionLifecycleTest-inPath-eeb77a18" description="clicks log" xmlns="uri:falcon:feed:0.1">
    <frequency>hours(1)</frequency>
    <timezone>UTC</timezone>
    <late-arrival cut-off="hours(1)"/>
    <clusters>
        <cluster name="RetentionLifecycleTest-corp-02f1746f" type="source">
            <validity start="2015-12-18T18:48Z" end="2015-12-18T20:48Z"/>
            <retention limit="hours(10)" action="delete"/>
            <lifecycle>
                <retention-stage>
                    <frequency>hours(3)</frequency>
                    <queue>default</queue>
                    <priority>LOW</priority>
                    <properties>
                        <property name="retention.policy.agebaseddelete.limit" value="hours(4)"/>
                    </properties>
                </retention-stage>
            </lifecycle>
        </cluster>
    </clusters>
    <locations>
        <location type="data" path="/tmp/falcon-regression/RetentionLifecycleTest/testFolders/${YEAR}/${MONTH}/${DAY}/${HOUR}"/>
        <location type="stats" path="/projects/falcon/clicksStats"/>
        <location type="meta" path="/projects/falcon/clicksMetaData"/>
    </locations>
    <ACL owner="pragya.mittal" group="dataqa" permission="*"/>
    <schema location="/schema/clicks" provider="protobuf"/>
    <properties/>
</feed>