oeqa/runtime/connman: Drop unused test

oeqa/runtime/connman: Drop unused test

This test checks for an IP address and then tests if interface aliases work. We
don't run it on any of our automated testing as it only applies for non-qemu.

The connectivity test is unrealted to connman and pretty pointless as it depends
on ssh being working, so networking is probably ok.

The alias interface test is unrelated to commman and a general networking test
but seems out of place.

The code uses obsolete ifconfig calls and overall, the value of the test we're
never using seems low. Delete it.

Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>