Append ntpservers if no previous servers in config

- skip writing ntpservers if none accessible
Change network restart to subprocess call
Add check for current MAC Address

- mac_repair now checks current MAC before repair
- version bump 1.0.8
Add ifcfg backup to clean_shutdown

- Add validation for ifcfg bootproto
Add function to generate new interface cfg

- Add basic interface config template
combined gen_interface and ifcfg template

- verison bump 1.1.0