modules/renumber: fix renumber.name behaviour

Fixes #760 (closed).

Also removes a warning in policy.REROUTE that is no longer true.

modules/policy/policy.lua

@@ -199,11 +199,6 @@ function policy.REROUTE(tbl, names)
 	local prefixes = {}
 	for from, to in pairs(tbl) do
 		local prefix = names and ren.name(from, to) or ren.prefix(from, to)
-		local bitlen = prefix[2]
-		if bitlen ~= nil and bitlen % 8 ~= 0 then
-			log_warn(ffi.C.LOG_GRP_POLICY,
-				'REROUTE: network mask - only /8, /16, /24 etc. are supported (entire octets are rewritten)')
-		end
 		table.insert(prefixes, prefix)
 	end
 	-- Return rule closure