we have offcially dropped python2, so it is possible
that our code run on python3 only host, so change
shebang to python3 to avoid error like:
python: command not found
(From OE-Core rev: a0b6ae56970aa53f65ed10bebd90fefa410a7099)
Signed-off-by: Changqing Li <changqing.li@windriver.com>
Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>
