CVE-2015-3156: Improper Link Resolution Before File Access

The writeconfig function in trove/guestagent/datastore/experimental/mongodb/service.py, resetconfiguration function in trove/guestagent/datastore/experimental/postgresql/service/config.py, writeconfig function in trove/guestagent/datastore/experimental/redis/service.py, writemycnf function in...