Add keepalive to client connection

I think it is good for the client to also has keepalive connection.
It will allow to detect connection lost faster when dealing with aggressive firewall.

assigned to @ced

added tryton type::behavior + 1 deleted label

tested en works fine. The session stays alive.

New changeset a7b7d0f30fe0 by C?dric Krier in branch 'default':
Activate SO_KEEPALIVE on socket
http://hg.tryton.org/tryton/rev/a7b7d0f30fe0

added 1 deleted label and removed 1 deleted label

closed