ssa.c: A couple of comment improvements for clarity

Signed-off-by: Hal Rosenstock <hal@mellanox.com>
Add reference count (wrapper) object and wrap SSA DBs with this where appropriate

In preparation for reference counting changes
Including improved message flow so objects can be destoryed when not in use

Signed-off-by: Hal Rosenstock <hal@mellanox.com>