test/power: skip KVM autotest if cannot run

power_kvm_vm_autotest should run on kvm vm and
virtio-ports should exist, if not test should skip.
Hence changed return as TEST_SKIPPED.

Fixes: 0ea2dd4409 ("test: skip when required lib not available")
Cc: stable@dpdk.org

Signed-off-by: Pallantla Poornima <pallantlax.poornima@intel.com>
Acked-by: Reshma Pattan <reshma.pattan@intel.com>

test/test/test_power_kvm_vm.c

@@ -101,7 +101,7 @@ test_power_kvm_vm(void)
 				"Power management environment\n",
 				TEST_POWER_VM_LCORE_ID);
 		rte_power_unset_env();
-		return -1;
+		return TEST_SKIPPED;
 	}
 
 	/* Test initialisation of previously initialised lcore */