test/py: cover get_basename crash on paths with dotted directories

Add a parametrized regression test for the fix in the previous commit.
The test invokes mkimage in auto-FIT mode (-f auto) with a -b argument
whose directory component contains a '.' and whose leaf either lacks an
extension or is a plain identifier. Before the fix these inputs caused
get_basename() to compute a negative length and segfault inside memcpy.
The test asserts that mkimage exits successfully and that the fdt
sub-image description matches the expected stripped basename, covering
"./mydt", "./sub.d/leaf", and "./a.b/c". A control input of "./mydt.dtb"
is also exercised to confirm normal extension stripping still works.

Signed-off-by: Aristo Chen <[email protected]>

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