This is a leftover of the "ip route" command migration to Pyroute2.
A new paremeter, "proto", is added to the IP route add and list
commands. The default protocol used is "static".
Story: #2007686
Task: #41284
Related-Bug: #1492714
Change-Id: I319fd0611d3e8a3a09d6d4e077a17a622f74f51c