dpdk: enable vfio_pci support

dpdk: enable vfio_pci support

Enable vfio_pci support for DPDK in the case where the end user
doesn't want to use igb_uio.
Changes:
* Use generic functions to strip the path and .ko extension from the
  module to be inserted/removed.
* Removed debug line in Modules_Manager.
* Removed commented code.
* Fixed all pylint issues.
JIRA: VSPERF-249

Change-Id: I69c9077735879bcbf7ce5c970c1ec53c219e9f90
Signed-off-by: Maryam Tahhan <maryam.tahhan@intel.com>
Reviewed-by: Martin Klozik <martinx.klozik@intel.com>
Reviewed-by: Al Morton <acmorton@att.com>
Reviewed-by: Christian Trautman <ctrautma@redhat.com>