Add samba/nfs packages to lvm manila backend

Manila LVM backend may provide both nfs/cifs shares. This patch
adds dependencies explicitly to be installed on node where manila-share
with lvm is configured.

Change-Id: I11955750438721ab9664d75ed2663fbd8841a9ce
diff --git a/manila/share/backend/lvm.yml b/manila/share/backend/lvm.yml
index 4dd589b..fe709da 100644
--- a/manila/share/backend/lvm.yml
+++ b/manila/share/backend/lvm.yml
@@ -8,6 +8,12 @@
           enabled: true
           name: manila-volume
           devices: ${_param:manila_lvm_devices}
+    system:
+      package:
+        samba:
+          - name: samba
+        nfs-kernel-server:
+          - name: nfs-kernel-server
   manila:
     share:
       enabled_share_backends: