scripts/install-debian-packages: add libnet-dev

travis-ci: success for scripts/install-debian-packages: add libnet-dev
Signed-off-by: Mike Rapoport <rppt@linux.vnet.ibm.com>
Signed-off-by: Pavel Emelyanov <xemul@virtuozzo.com>

contrib/debian/dev-packages.lst

@@ -5,6 +5,7 @@ libprotobuf-c0-dev
 protobuf-c-compiler
 protobuf-compiler
 python-protobuf
+libnet-dev
 
 # Extra packages, required for testing and building other tools
 pkg-config