[YOCTO #4772]
When path:file change to python function, it maybe include '@' character.
So, add the special character to change to '_' for avoid error.
(Bitbake rev: 684bc6dcb11ecb1fd7a4d25c08909ad9879e8342)
Signed-off-by: Li Wang <li.wang@windriver.com>
Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>