Add new configuration parameter err_smdb_dump for access layer

A new configuration parameter is added to access node:
   err_smdb_dump

If PRDB calculation fails, this config parameter allows
SMDB used for the calculation to be saved. SMDB is placed
in smdb_dump_dir folder in "epoch" subfolder.

Possible values:
   0 - don't dump (default)
   1 - dump in binary mode
   2 - dump in debug mode
   3 - dump in human readable mode

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