feat: Single configuration source for hostname and domain

[MatrixEditor]

As Is

Every server defines its own hostname, domain name or DNS entries. This can be tedious to configure when targeting multiple protocol servers all at once. This behavior is currently achieved by using the FQDN option - naming is not intuitive and there is no CLI option.

To Be

One single configuration attribute that can be used to specify the host's computer/hostname and domain:

# By default (fallback), the value should be defined in the [Globals] section
[Globals]

Host = "<HOSTNAME>.<DOMAIN>"
# All subsequent options should derive their values from this single configuration option:
# NetBIOSDomainName = Host.split(".", 1)[1].upper()
# DNSHostName = Host.split(".", 1)[0]
# NetBIOSName = Host.split(".", 1)[0][:15].upper()
# DNSDomainName = Host.split(".", 1)[1].lower()

There should be a CLI option too:

sudo dementor -I eth0 -H DC01.contoso.lab
# or
sudo dementor -I eth0 -O Host="DC01.contoso.lab"