Install linux-image-extra when uio_pci_generic is selected as driver
Install linux-image-extra when uio_pci_generic is selected as driver

uio_pci_generic is a standard linux kernel module.
On ubuntu this kernel module is distrobuted as part of
linux-image-extra.

When the dpdk driver is set to uio_pci_generic linux-image-extra should
be installed.

Change-Id: I2d75fdd8ad5572d183455c202509d8f07bdbea72
Closes-Bug: #1612792

openstack/networking-ovs-dpdk,stackforge/networking-ovs-dpdk,stackforge/networking-ovs-dpdk,openstack/networking-ovs-dpdk,stackforge/networking-ovs-dpdk