[swss-common] update submodule for sonic-swss-common (#3916)

update multiDB changes in sonic-swss-common, including:

[Enhancement] debian/conffiles will give prompt when file existing, need a way to supress prompt (#323)

[MultiDB]:swsscommon replace old API with new APIs including tests (#324)

Signed-off-by: Dong Zhang d.zhang@alibaba-inc.com

Author: dzhangalibaba