Goal:

Neutron-fwaas is service plugin which needs to be enabled on the neutron server side thus we need to have way to enable it through the Neutron CR. To achieve that we can do one of two things:

• add new config option in the Neutron CRD, like e.g. `neutronFwaas` which will have values `True` or `False` and once this is set to `True` then operator will do all necessary configuration or
• document how this can be enabled in existing CRs using `customServiceConfig` option.

This should also take into consideration use case when fwaas is enabled post initial deployment and then it's not only configuration change but also needs to run db sync job.