Nailgun initial arguments

This PR is not for discussion only. Do not apply it.

With these changes you should explicitly define initial arguments for the master node deployment. They should be placed to /etc/naily.facts file. Here they are:
```
$ cat /etc/naily.facts
mnbs_internal_ipaddress=10.20.0.2
mnbs_internal_netmask=255.255.255.0
mnbs_static_pool_start=10.20.0.130
mnbs_static_pool_end=10.20.0.250
mnbs_dhcp_pool_start=10.20.0.10
mnbs_dhcp_pool_end=10.20.0.120
mnbs_internal_interface=eth1
```