Adding SMDB update module

Previous SMDB is updated with the current one,
and the current is updated with the dumped dump_db.

Signed-off-by: Ilya Nelkenbaum <ilyan@mellanox.com>
Signed-off-by: Hal Rosenstock <hal.rosenstock@gmail.com>
ssa_database.h: Adding additional comments

Signed-off-by: Ilya Nelkenbaum <ilyan@mellanox.com>
Signed-off-by: Hal Rosenstock <hal.rosenstock@gmail.com>