Rename this class to be python-prefixed to match the other new Python
build system classes.
(From OE-Core rev: 25d6bf8079797906bde7c0cf63a0466c981ba5bb)
Signed-off-by: Ross Burton <ross.burton@arm.com>
Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>