Change HeaderDigest to default to None,CRC32C instead of None

This allows our default setting to work with any target configuration.

lib/init.c

@@ -70,6 +70,7 @@ iscsi_create_context(const char *initiator_name)
 	iscsi->use_initial_r2t                        = ISCSI_INITIAL_R2T_NO;
 	iscsi->want_immediate_data                    = ISCSI_IMMEDIATE_DATA_YES;
 	iscsi->use_immediate_data                     = ISCSI_IMMEDIATE_DATA_YES;
+	iscsi->want_header_digest                     = ISCSI_HEADER_DIGEST_NONE_CRC32C;
 
 	return iscsi;
 }