IMHO many users are used to call `umount()`. Methods `umount()` and `unmount()` are really
easy to mixed up also when user see somewhere in the code or in the documentation
`mount()` automatic reaction is look for `umount()`.
I think it's better to have alias for existing method then anger user because of
unpredictable names.
But the main word here have the storage guys, they are using blivet most so @dwlehman,
@vpodzime, @vojtechtrefny what do you think?
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To view this pull request on github, visit
https://github.com/rhinstaller/blivet/pull/235