fuel plugin: Provide required libudev1 version

fuel plugin: Provide required libudev1 version

The latest fuel .iso has changed provided libudev1 version from 20.18 to
20.15.  As the later version is required for the plugin we now provide
it directly in the plugin's repo.

Change-Id: Ida93a9971185d13aa476a6192bca949b854f42af
Signed-off-by: Billy O'Mahony <billy.o.mahony@intel.com>
Reviewed-by: Jonas Bjurel <jonas.bjurel@ericsson.com>
Reviewed-by: Mark D. Gray <mark.d.gray@intel.com>
Reviewed-by: Tom Herbert <therbert@redhat.com>
Reviewed-by: Michal Skalski <mskalski@mirantis.com>
Reviewed-by: Stefan Berg <stefan.k.berg@ericsson.com>