totem: drop crypt_accept: concept/option

totem: drop crypt_accept: concept/option

this was another old onwire compat mode that is not useful anylonger.

we can safely move the new model by default.

According to Honza (real hardware 1 node testing) there are no
performance impact.

My tests (8 nodes VM cluster), there is up to 10/12% performance
improvements up to 1M packet size where old and new models are equal.

As a side note, nss still shows to be a performance loss on both
real and virtual hw (without any kind of nss hw acceleration).

Signed-off-by: Fabio M. Di Nitto <fdinitto@redhat.com>
Reviewed-by: Steven Dake <sdake@redhat.com>