Critical Description
When Falcon get build, extensions directory in $FALCON_HOME don't contain required properties, template and workflow files for hdfs-mirroring, hdfs-snapshot-mirroring and hive-mirroring extensions.
Also I found that *.extension.store.uri is missing from $FALCON_HOME/conf/startup.properties . It must be provided with some default path value like "/tmp/extensions" so that user just copy the directory $FALCON_HOME/extensions to "/tmp" by default.