sqlite_default has been hard-coded to /tmp, usegettempdir instead, (#19255)
sqlite_default has been hard-coded to /tmp, usegettempdir instead, (#19255)

respecting tempdir enviroment variables.
See #19208, #19229.
lyft/incubator-airflow,lyft/incubator-airflow,nathanielvarona/airflow,bolkedebruin/airflow,cfei18/incubator-airflow,Acehaidrey/incubator-airflow,lyft/incubator-airflow,apache/airflow,mistercrunch/airflow,nathanielvarona/airflow,apache/incubator-airflow,bolkedebruin/airflow,apache/incubator-airflow,apache/airflow,Acehaidrey/incubator-airflow,danielvdende/incubator-airflow,danielvdende/incubator-airflow,nathanielvarona/airflow,apache/incubator-airflow,bolkedebruin/airflow,apache/airflow,Acehaidrey/incubator-airflow,lyft/incubator-airflow,apache/airflow,apache/airflow,cfei18/incubator-airflow,cfei18/incubator-airflow,Acehaidrey/incubator-airflow,nathanielvarona/airflow,mistercrunch/airflow,danielvdende/incubator-airflow,mistercrunch/airflow,nathanielvarona/airflow,mistercrunch/airflow,bolkedebruin/airflow,apache/airflow,Acehaidrey/incubator-airflow,cfei18/incubator-airflow,danielvdende/incubator-airflow,Acehaidrey/incubator-airflow,cfei18/incubator-airflow,cfei18/incubator-airflow,apache/incubator-airflow,bolkedebruin/airflow,nathanielvarona/airflow,danielvdende/incubator-airflow,danielvdende/incubator-airflow