Retrieve IPv6 addresses from VMs

This commit allows the model to fetch IPv6 addresses
from running VMs and populate VirtualMachine objects
with the value if it was retrieved successfully

capsulflask/shell_scripts/get.sh

@@ -29,7 +29,8 @@ if virsh domuuid "$vmname" | grep -vqE '^[\t\s\n]*$'; then
   esac
 fi
 
-# this gets the ipv4
+# this gets the vm ip addresses
 ipv4="$(virsh domifaddr "$vmname" | awk '/ipv4/ {print $4}' | cut -d'/' -f1)"
+ipv6="$(virsh domifaddr "$vmname" | awk '/ipv6/ {print $4}' | cut -d'/' -f1)"
 
-echo "$exists $state $ipv4"
+echo "$exists $state $ipv4 $ipv6"