[sonic-pyswssdk] submodule update with PR's:

[configdb.py]: Allow deletion of entire table from mod_config API. (#61)
[MultiDB] mimic redis-dump-load , adding sonic_db_dump_load.py and so… 
[MultiDB] add sonic-db-cli PING all instances support (#65)
Fix sonic-db-cli script to be compatible with python3 and python2.7 (#66)
Namespace support in SonicV2Connector (#63)
[Multiasic]: Add calculation of interface index for backplane interfa…