iproute: continue to change naming scheme

three general methods:
 * link()
 * addr()
 * route()

shortcuts: addr_add(), addr_del(), route_add(), route_del(), link_up(), link_down(),
  link_rename(), link_remove()

listing methods: get_links(), get_routes(), get_neighbors(), get_addr()

 * in-code documentation updated
 * tests removed (actually, they should be replaced later)