RooftopPvParser can not handle InfluxDB profiles

[noracato]

In __set_production of the RooftopPvParser we add the values of the profiles of the ports like this:

self.production = sum((asset.port[0].profile[0].value for asset in assets_generator))

However, when a profile is referenced like in the InfluxDBProfile object, there is no direct attribute value. We should find another way to get this value. As we cannot access the db from our app, the profile needs to be supplied to our API. Plan is to:

• [ ] Create a new field in the API for profiles
• [ ] Store the intermediate profiles in a new object/class
• [ ] Mock the current implementation of the InfluxDBProfile object to reference our new profile objects.
• [ ] Think of what to do (or tell the user) when the profile was not supplied

Part of #82

[noracato]

For now I added a mocked method that returns 0 as a value when a profile was not found, so that the files at least make it through the API. We should change that according to the description of this issue.

See: https://github.com/quintel/etm-esdl/blob/b07e8a235171671420aabe888bb5de2090b6e774/app/models/parsers/rooftop_pv.py#L47-L57