Alexandre Lision authored Feb 12, 2016 and Adrien Béraud committed Apr 14, 2016

- do not read dhtPort when deserializing a Ring account, use a new
one at runtime
- cache directory is created when generating dhParams
- use key stretching for archive encryption
- bump OpenDHT to add key stretching support

This commit comes with a necessary bump of OpenDHT

Tuleap: #335
Change-Id: Iee67569d378baaa33e9acd7cd9557422ab8e0471