Removed unused property: hadoop.default.download.url
Removed unused property: hadoop.default.download.url

There shouldn't be a default download url. It should
be explicitly specified in default.properties instead.
splunk/splunk-shuttl,splunk/splunk-shuttl,splunk/splunk-shuttl,splunk/splunk-shuttl,splunk/splunk-shuttl,splunk/splunk-shuttl