Remove handshake_container_t alignment.
Remove handshake_container_t alignment.

We weren't observing it when allocating anyways. And on some hosts
gcc was (correctly) using it generate movdqa-s that segfaulted.

TESTED=manual, on CI server where it was happening

Change-Id: I6a8fcba509ea08fd3f60bef422547f169f228ddc

s-kanev/XIOSim,s-kanev/XIOSim,s-kanev/XIOSim,s-kanev/XIOSim