test/eventdev: verify priority test prerequisite
test/eventdev: verify priority test prerequisite

octeontx specific priority test expects priority of each
event queue to be a unique value. Verify that condition
before it processes to test the priority.

Signed-off-by: Jerin Jacob <5bca7d2a432bc0f5422b70b2701a4e4fa32edd00@caviumnetworks.com>

john-mcnamara-intel/dpdk,john-mcnamara-intel/dpdk,john-mcnamara-intel/dpdk,john-mcnamara-intel/dpdk