Handle a couple of cases/exceptions when service have gone away
UT for db_handler.cc
Merge pull request #346 from Juniper/rajreddy_ut2

UT for db_handler.cc
Merge pull request #345 from Juniper/dsetia-bugfix

Handle a couple of cases/exceptions when service have gone away
Merge remote-tracking branch 'github/master' into ananth_commit
change default port to query port