test: Convert fs_helper to use a class

Create a class around mk_fs() (and later setup_image()) to handle the
common tasks of image creation. Many callers of fs_helper.mk_fs()
create their own scratch directories while users of
fs_helper.setup_image() rely on one being returned. Unify this by
adding 'srcdir' as a field while converting to a class.

The class delegates to the existing mk_fs() function for the actual
filesystem creation, adding lifecycle management for scratch
directories and the image file.

Signed-off-by: Simon Glass <[email protected]>
Reviewed-by: Tom Rini <[email protected]>

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