test: fix EAL flags autotest on FreeBSD

test: fix EAL flags autotest on FreeBSD

FreeBSD does not support running multiple primary processes
concurrently, because all DPDK instances will allocate memory
from the same place (memory provided by contigmem driver).
While it is technically possible to launch a DPDK process
using no-shconf switch, it will actually corrupt main process'
for the above reason.

Fix EAL flags autotest to not run primary processes unless
both no-shconf and no-huge are specified.

Cc: stable@dpdk.org
Signed-off-by: Anatoly Burakov <anatoly.burakov@intel.com>
Tested-by: Changqing Wu <changqingx.wu@intel.com>