Indexer components use debug.go for data path

This allows to easily change the logging levels from
command-line

Change-Id: I84d155d4de306adddc29b41b75bcea262794fb30
Reviewed-on: http://review.couchbase.org/38960
Reviewed-by: Deepkaran Salooja <deepkaran.couchbase@gmail.com>
Tested-by: Deepkaran Salooja <deepkaran.couchbase@gmail.com>