Add remote host variable for DB

[Nolsta]

With @Nyawanga Edit zcrmsdk git libraries, add remote host variables to allow us to connect to aurora db instead of local host only.

[ioluwayo]

This is a no brainer. Especially for serverless deployments. I have had to use the persistence_handler_class to implement remote host.

The implementation is also very opinionated with regards to logging. It assumes write access to a log file on the file system which is not always the case. Writing to stdout or the ability to modify this will be ideal