[cfggen] Support reading from and writing to configdb#808

Merged

taoyl-ms merged 11 commits intosonic-net:masterfrom

taoyl-ms:taoyl/cfggen

Aug 2, 2017

Commits on Jul 20, 2017

Commits on Jul 25, 2017

Update sonic-utilities pointer
taoyl-ms
committed

Commits on Jul 28, 2017

Update sonic-py-swsssdk pointer
taoyl-ms
committed

Commits on Aug 1, 2017

Decouple start.sh and redis-server in docker-database
taoyl-ms
committed