[AIRFLOW-5301] Remove not-yet-existing files from mounts (#5901)
[AIRFLOW-5301] Remove not-yet-existing files from mounts (#5901)

This should be only merged if breeze is not yet merged.
danielvdende/incubator-airflow,mtagle/airflow,apache/incubator-airflow,lyft/incubator-airflow,sekikn/incubator-airflow,Acehaidrey/incubator-airflow,nathanielvarona/airflow,DinoCow/airflow,dhuang/incubator-airflow,spektom/incubator-airflow,danielvdende/incubator-airflow,apache/incubator-airflow,cfei18/incubator-airflow,mistercrunch/airflow,mistercrunch/airflow,bolkedebruin/airflow,danielvdende/incubator-airflow,mistercrunch/airflow,Acehaidrey/incubator-airflow,bolkedebruin/airflow,wooga/airflow,DinoCow/airflow,apache/airflow,Fokko/incubator-airflow,cfei18/incubator-airflow,apache/airflow,apache/airflow,DinoCow/airflow,sekikn/incubator-airflow,sekikn/incubator-airflow,mrkm4ntr/incubator-airflow,cfei18/incubator-airflow,lyft/incubator-airflow,Fokko/incubator-airflow,spektom/incubator-airflow,mtagle/airflow,dhuang/incubator-airflow,nathanielvarona/airflow,nathanielvarona/airflow,nathanielvarona/airflow,bolkedebruin/airflow,lyft/incubator-airflow,lyft/incubator-airflow,danielvdende/incubator-airflow,apache/airflow,Acehaidrey/incubator-airflow,Fokko/incubator-airflow,apache/airflow,mrkm4ntr/incubator-airflow,apache/airflow,DinoCow/airflow,wooga/airflow,wooga/airflow,apache/incubator-airflow,wooga/airflow,danielvdende/incubator-airflow,danielvdende/incubator-airflow,cfei18/incubator-airflow,mistercrunch/airflow,dhuang/incubator-airflow,nathanielvarona/airflow,airbnb/airflow,wileeam/airflow,dhuang/incubator-airflow,spektom/incubator-airflow,wileeam/airflow,mtagle/airflow,wileeam/airflow,sekikn/incubator-airflow,Fokko/incubator-airflow,spektom/incubator-airflow,Acehaidrey/incubator-airflow,nathanielvarona/airflow,bolkedebruin/airflow,cfei18/incubator-airflow,mrkm4ntr/incubator-airflow,mtagle/airflow,airbnb/airflow,cfei18/incubator-airflow,apache/incubator-airflow,airbnb/airflow,Acehaidrey/incubator-airflow,mrkm4ntr/incubator-airflow,airbnb/airflow,Acehaidrey/incubator-airflow,wileeam/airflow,bolkedebruin/airflow