Remove debs for diablo volumes

Diablo is long gone. Remove debs for diablo nova volumes

Original commit that added this: I3e7c412ff125dbadd18b59af55fb7dea9ea17b07

Move open-iscsi requirement over to ironic, (ironic conductor calls
iscsiadm)

libvirt driver uses iscsiadm for iscsi based volume attaches as well.
lvm backend is supported for libvirt driver

Change-Id: I536ba0ebdb6e3fa68f0a82b3027e70d8e2f35085
diff --git a/files/debs/ironic b/files/debs/ironic
index f6c7b74..0a906db 100644
--- a/files/debs/ironic
+++ b/files/debs/ironic
@@ -4,6 +4,7 @@
 ipxe
 libguestfs0
 libvirt-bin
+open-iscsi
 openssh-client
 openvswitch-switch
 openvswitch-datapath-dkms
diff --git a/files/debs/n-cpu b/files/debs/n-cpu
index 534b1c1..5d5052a 100644
--- a/files/debs/n-cpu
+++ b/files/debs/n-cpu
@@ -1,8 +1,6 @@
 qemu-utils
-# Stuff for diablo volumes
-lvm2
+lvm2 # NOPRIME
 open-iscsi
-open-iscsi-utils # Deprecated since quantal dist:precise
 genisoimage
 sysfsutils
 sg3-utils