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Automatic merge from submit-queue (batch tested with PRs 39768, 39463) Check if path exists before performing unmount This is part 3 of an effort to check if path exists before performing an unmount operation. [Part 1](https://github.com/kubernetes/kubernetes/pull/38547) and [part 2](https://github.com/kubernetes/kubernetes/pull/39311) involved auditing the different volume plugins and refactoring their `TearDownAt()s` to use the common util function/or create one if absent. The ideal way to do this change would involve refactoring of the `TearDownAt()s` of these plugins and make a common util function that checks path. (The plugins involved in this PR use someway of unmounting a bind mount and unmounting a global path, there is also refactoring needed to consolidate disk_manager of fc, rbd and iscsi). A non-goal part of this effort can also involve refactoring all the `SetupAt()s` In the interest of time and considering other higher priority issues that I am caught up with, I am unable to give the time the refactoring needs. Hence I've made the minimum change that would give the desired output. I am tracking the work pending in this issue: https://github.com/kubernetes/kubernetes/issues/39251 ```release-note NONE ```