TEST: Add test for the protection information setting in READCAPACITY16

If the device does not support PI (INQ->PROTECT) then
verify that PROT_EN, P_TYPE and P_I_EXP are all zero.

If the device does support PI and IF PROT_EN is clear
then verify that both P_TYPE and P_I_EXP are zero.

If the device does support PI and IF PROT_EN is set
then verify that P_TYPE is 0, 1 or 2

test-tool/iscsi-test-cu.c

@@ -212,6 +212,7 @@ static CU_TestInfo tests_readcapacity10[] = {
 static CU_TestInfo tests_readcapacity16[] = {
 	{ (char *)"ReadCapacity16Simple", test_readcapacity16_simple },
 	{ (char *)"ReadCapacity16Alloclen", test_readcapacity16_alloclen },
+	{ (char *)"ReadCapacity16PI", test_readcapacity16_protection },
 	CU_TEST_INFO_NULL
 };