Add ubuntu18

  * Info about Ubiquity https://wiki.ubuntu.com/UbiquityAutomation
    - we do exactly partitioning=> no possibility for now, to use
    new installer type.
  * Move growlvm.py to commons

Change-Id: Iabda3770b368a48919fef89d3a78cae388f60168
Prod-related: PROD-28155 (PROD:28155)
diff --git a/ubuntu-18.04/config-drive/meta-data b/ubuntu-18.04/config-drive/meta-data
new file mode 100644
index 0000000..c7ba190
--- /dev/null
+++ b/ubuntu-18.04/config-drive/meta-data
@@ -0,0 +1 @@
+hostname: ubuntu