Mark sql_connection with secret flag
Mark sql_connection with secret flag

sql_connection contains the password in some setups and marking as
secret prevents accidental logging

fixes bug 1160680

Change-Id: Ib2d00219ea40a010c62e6a29045309f030e6de28

JioCloud/oslo-incubator,JioCloud/oslo-incubator,JioCloud/oslo-incubator