pyaerocom gives warnings about files not being in metastandards version

[heikoklein]

Describe the bug
Please provide a clear and concise description of what the bug is.

• Pyaerocom version: 0.16
• Error message (if applicable):

pyaerocom.metastandards:INFO:Invalid or old data ID ECMWF_CAMS_REAN. Consider format <model-name>-<meteo-config>_<experiment>-<perturbation>

This info message is confusing and not real since metastandards are not enforced in pyaerocom yet, and 4 different standards are possible while only one is tested.

To Reproduce
python cfg_benchmark.py

Expected behavior
No INFO/warning should be given on default, DEBUG-message still possible.

[Ovewh]

I think the "Meteorology config substring in data_id {meteo} needs to start with met." warming should also only be a DEBUG message not warning. Since this is also not enforced.