fix sdn-plugin package instalation

Remove non-existing python3-cvprac package dependency
Install cvprac with post installation

Change-Id: I610fa54a580c8ca2a829e2cc0803740644125c12
Signed-off-by: tierno <alfonso.tiernosepulveda@telefonica.com>
diff --git a/RO-SDN-arista/Makefile b/RO-SDN-arista/Makefile
index 6117980..1606bb3 100644
--- a/RO-SDN-arista/Makefile
+++ b/RO-SDN-arista/Makefile
@@ -20,5 +20,6 @@
 
 package:
 	python3 setup.py --command-packages=stdeb.command sdist_dsc
+	cp debian/python3-osm-rosdn-arista.postinst deb_dist/osm-rosdn-arista*/debian/
 	cd deb_dist/osm-rosdn-arista*/ && dpkg-buildpackage -rfakeroot -uc -us