test: remove autotest python wrapper

test: remove autotest python wrapper

This tool was used in the past to execute unit tests with make.
Meson has its own list of unit test, and its own way of calling them.

Since the switch to meson only builds, there is nothing depending on the
script in DPDK itself.
No CI seems to call it, time to put it to rest.

Signed-off-by: David Marchand <david.marchand@redhat.com>
Acked-by: Bruce Richardson <bruce.richardson@intel.com>
Acked-by: Aaron Conole <aconole@redhat.com>