Add bash, python or perl to the ptest pkgs to fix the RDEPENDS issues.
(From OE-Core rev: d081a85fc76e2b7a469c6c70175ecf7aed9de053)
Signed-off-by: Robert Yang <liezhi.yang@windriver.com>
Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>