Revert "Implement _umount() for cases where filesystem umount doesn't work"
Revert "Implement _umount() for cases where filesystem umount doesn't work"

This reverts commit be1eff2b4ba57c8f97128dacefb5271549c16d51.

jxmx/pfsense,pfsense/pfsense,dennypage/pfsense,dennypage/pfsense,ptorsten/pfsense,brunostein/pfsense,brunostein/pfsense,NewEraCracker/pfsense,dennypage/pfsense,phil-davis/pfsense,phil-davis/pfsense,NewEraCracker/pfsense,ptorsten/pfsense,NewEraCracker/pfsense,NOYB/pfsense,jxmx/pfsense,dennypage/pfsense,jxmx/pfsense,pfsense/pfsense,NOYB/pfsense,ptorsten/pfsense,phil-davis/pfsense,pfsense/pfsense,NOYB/pfsense,phil-davis/pfsense,NewEraCracker/pfsense,pfsense/pfsense,brunostein/pfsense