Limit amount of data sent by distributed Node

**gaspardzebear** ([Bug 61743](https://bz.apache.org/bugzilla//show_bug.cgi?id=61743&redirect=false)):
When doing remote testing, remote nodes may send lot of datas to master.
When remote node are in different geographical location, the bandwidth consumption is high.

None of the current mode is satisfying :
- The statistical mode is not really usefull as it gives too few informations.
- Stripped mode truncate datas.
- Diskstore just postpones the sending of datas : the whole file is still sent as-is at the end of test.

In order to reduce the amount of data, compress the flow would limit the requested bandwith could be a good approach (for example, Diskstore mode + compression) : as most of the flow is text, it could save 70-80% bandwitdh.

OS: All