ASM 2555 Deployment with no gateway on iscsi network fails

Don't add the gateway and subnet values to the configuration if they are not set

fix typo
Merge pull request #92 from logankimmel/ASM-2555

ASM 2555 Deployment with no gateway on iscsi network fails
Fixed an issue where boot from san was not writing mac addresses.
Merge pull request #94 from asaenz/bfs_mac_fix

ASM-2560: Boot from san was not writing mac addresses for 2nd port