mgr/diskprediction_local: Updated prediction models to use only supported python...

mgr/diskprediction_local: Updated prediction models to use only supported python packages.

Removed non-supported python packages from requirements.txt
Added scikit-learn based models, removed rgf-python based models.
Updated config.json and DiskPredictor.__preprocess for the same.
Also added manufacturer as argument to DiskPredictor.__preprocess

Updated manufacturer lookup - first check if available as smartctl field,
if not then try to infer from model name.
Updated predicted class to be the prediction for the most recent day in
time series data given.
Updated naming convention from "preprocessor" to "scaler".

Signed-off-by: Karanraj Chauhan <kachauha@redhat.com>