* Using table driven test for set_authinfo_test.go
* Added required golden files
* Review comments implemented
* varibale naming updated to be more readable
* 2 functions merged into one with tests defined in list and
iterated
* removed expected config and directly used values (username/password) for verification
* Had to adjust the code as per lates merged changes for config cleanup
Change-Id: I167d651a2e5bcd2905e453ef47a88e02d08487a7