Currently only the dnf package manager tests are automatically added to the
list of tests to run. Improve the code to handle automatic addition of
the apt and opkg tests too.
(From OE-Core rev: c9169e4d1fa67289d5beb0e1f8fb5c54153c4242)
Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>