newvm: Add domain argument

Now that we have multiple domains (_pyrocufflink.blue_ for AD domain
members and _pyrocufflink.black_ for the new machines), we need a way to
specify the domain for new machines when they are created.  Thus, the
`newvm.sh` script accepts either an FQDN or a `--domain` argument.  The
DHCP server will register the DNS name in the zone containing the
machine's domain name.

newvm.sh

@@ -7,6 +7,7 @@ disk_size=16
 kickstart=http://rosalina.pyrocufflink.blue/~dustin/kickstart/fedora.ks
 fedora=$(rpm -E %fedora)
 network=network=prod
+dnsdomain=pyrocufflink.blue
 console=true
 
 usage() {
@@ -65,6 +66,13 @@ while [ $# -gt 0 ]; do
     --network=*)
         network="${1#*=}"
         ;;
+    --domain)
+        shift
+        dnsdomain=$1
+        ;;
+    --domain=*)
+        dnsdomain=${1#=*}
+        ;;
     --no-console|--noconsole)
         console=false
         ;;
@@ -88,6 +96,16 @@ if [ -z "${name}" ]; then
     exit 2
 fi
 
+case ${name} in
+*.*)
+    hostname=${name}
+    name=${name%%.*}
+    ;;
+*)
+    hostname=${name}.${dnsdomain}
+    ;;
+esac
+
 if [ -z "${LIBVIRT_DEFAULT_URI}" ]; then
     printf 'LIBVIRT_DEFAULT_URI is not set.\n' >&2
     printf 'If you want to create a new VM locally, explicitly set '
@@ -110,7 +128,7 @@ else
     printf 'Using HTTP proxy: %s\n' "${http_proxy}" >&2
 fi
 
-extra_args="ip=::::${name}::dhcp inst.ks=${kickstart}"
+extra_args="ip=::::${hostname}::dhcp inst.ks=${kickstart}"
 if [ -n "${http_proxy}" ]; then
     extra_args="${extra_args} inst.proxy=${http_proxy}"
     if [ ${fedora} -lt 40 ]; then