[AIRFLOW-3449] Write local dag parsing logs when remote logging enabled. (#5175)
[AIRFLOW-3449] Write local dag parsing logs when remote logging enabled. (#5175)

The default "processor" handler is a FileProcessorHandler (compare to
FileTaskHandler as the default "task" handler) so setting this as a
subclass of FileTaskHandler ended up with an invalid path for the
processor logs, meaning they never got written to a file when remote
logging is enabled.

This was likely a mis-configuration introduced in #2793
sekikn/incubator-airflow,nathanielvarona/airflow,dhuang/incubator-airflow,DinoCow/airflow,dhuang/incubator-airflow,cfei18/incubator-airflow,DinoCow/airflow,bolkedebruin/airflow,Acehaidrey/incubator-airflow,Acehaidrey/incubator-airflow,nathanielvarona/airflow,bolkedebruin/airflow,danielvdende/incubator-airflow,nathanielvarona/airflow,apache/airflow,danielvdende/incubator-airflow,cfei18/incubator-airflow,cfei18/incubator-airflow,spektom/incubator-airflow,DinoCow/airflow,airbnb/airflow,apache/incubator-airflow,Acehaidrey/incubator-airflow,Fokko/incubator-airflow,danielvdende/incubator-airflow,r39132/airflow,wileeam/airflow,Acehaidrey/incubator-airflow,apache/airflow,wileeam/airflow,sekikn/incubator-airflow,mistercrunch/airflow,spektom/incubator-airflow,wileeam/airflow,Fokko/incubator-airflow,mistercrunch/airflow,cfei18/incubator-airflow,mtagle/airflow,spektom/incubator-airflow,dhuang/incubator-airflow,danielvdende/incubator-airflow,cfei18/incubator-airflow,mistercrunch/airflow,bolkedebruin/airflow,lyft/incubator-airflow,apache/airflow,Acehaidrey/incubator-airflow,apache/incubator-airflow,bolkedebruin/airflow,nathanielvarona/airflow,lyft/incubator-airflow,mrkm4ntr/incubator-airflow,danielvdende/incubator-airflow,apache/airflow,mtagle/airflow,mtagle/airflow,airbnb/airflow,DinoCow/airflow,spektom/incubator-airflow,apache/incubator-airflow,lyft/incubator-airflow,sekikn/incubator-airflow,bolkedebruin/airflow,Acehaidrey/incubator-airflow,airbnb/airflow,apache/airflow,mrkm4ntr/incubator-airflow,lyft/incubator-airflow,mrkm4ntr/incubator-airflow,Fokko/incubator-airflow,wooga/airflow,wooga/airflow,sekikn/incubator-airflow,wooga/airflow,nathanielvarona/airflow,wooga/airflow,mrkm4ntr/incubator-airflow,mistercrunch/airflow,r39132/airflow,Fokko/incubator-airflow,wileeam/airflow,cfei18/incubator-airflow,danielvdende/incubator-airflow,dhuang/incubator-airflow,mtagle/airflow,apache/incubator-airflow,r39132/airflow,nathanielvarona/airflow,r39132/airflow,airbnb/airflow,apache/airflow