ibacm: Add the ability to preload the destination GID and LID caches from SSA DB

The preloading is from SSA Access Layer output in "ssa_db" format.
'access_v1' option has to be specified and instead of single
route data file, ssa_db directory path must be specified.

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