Do not install openvswitch-datapath-dkms on Ubuntu 14.04

Change-Id: I8c58d998011427a202c79c45b87b5eca5ceaaa71
Closes-bug: #1331111
diff --git a/lib/neutron_plugins/ovs_base b/lib/neutron_plugins/ovs_base
index e1c3c3f..e13cbb1 100644
--- a/lib/neutron_plugins/ovs_base
+++ b/lib/neutron_plugins/ovs_base
@@ -38,7 +38,14 @@
     # FIXME add to ``files/apts/neutron``, but don't install if not needed!
     if is_ubuntu; then
         kernel_version=`cat /proc/version | cut -d " " -f3`
-        install_package make fakeroot dkms openvswitch-switch openvswitch-datapath-dkms linux-headers-$kernel_version
+        ovs_packages="make fakeroot dkms openvswitch-switch"
+        # From kernel 3.13 on, openvswitch-datapath-dkms is not needed
+        kernel_major_minor=`echo $kernel_version | cut -d. -f1-2`
+        if [ `vercmp_numbers "$kernel_major_minor" "3.13"` -lt "0" ]; then
+            ovs_packages="$ovs_packages openvswitch-datapath-dkms"
+        fi
+        ovs_packages="$ovs_packages linux-headers-$kernel_version"
+        install_package $ovs_packages
     elif is_fedora; then
         install_package openvswitch
         # Ensure that the service is started