Add "dump" command to tsdb tool to dump all samples (#532)
Add "dump" command to tsdb tool to dump all samples (#532)

* Add "dump" command to tsdb tool to dump all samples

Signed-off-by: Julius Volz <d7748b1e6f41fd74500c5ccae0980eab88c2ef61@gmail.com>

prometheus/prometheus,alileza/prometheus,prometheus/prometheus,alileza/prometheus,kangwoo/prometheus,keegancsmith/prometheus,keegancsmith/prometheus,GoogleCloudPlatform/prometheus,alileza/prometheus,prometheus/prometheus,GoogleCloudPlatform/prometheus,alileza/prometheus,GoogleCloudPlatform/prometheus,GoogleCloudPlatform/prometheus,prometheus/tsdb,keegancsmith/prometheus,Gouthamve/prometheus,Gouthamve/prometheus,kangwoo/prometheus,keegancsmith/prometheus,kangwoo/prometheus,alileza/prometheus,prometheus/prometheus,Gouthamve/prometheus,GoogleCloudPlatform/prometheus,kangwoo/prometheus,keegancsmith/prometheus,prometheus/prometheus,Gouthamve/prometheus