python-smartpm: truncate the filename to meet NAME_MAX
There is a "File name too long" error when len(TMPDIR) = 410, this is
because the function getLocalPath() converts the filepath into the
filename, so there would be the error when len(filename)
> NAME_MAX, truncate the filename to meet NAME_MAX will fix the problem.
[YOCTO #5201]
Signed-off-by: Robert Yang <liezhi.yang@windriver.com> Signed-off-by: Saul Wold <sgw@linux.intel.com> Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>
