Add kwargs to unmount and move mountpoint check into _preSetup
Add kwargs to unmount and move mountpoint check into _preSetup

_preSetup should contain all the logic related to whether or not to
execute the mount, this moves the mountpoint chroot check from _setup
into it.

vojtechtrefny/blivet,vojtechtrefny/blivet,dwlehman/blivet,rhinstaller/blivet,vpodzime/blivet,rhinstaller/blivet,jkonecny12/blivet,AdamWill/blivet,vpodzime/blivet,rvykydal/blivet,dwlehman/blivet,rvykydal/blivet,jkonecny12/blivet,AdamWill/blivet