Fix few nits with depreaction of --reconfigurable

This removes the --reconfigurable flag in the bench command entirely
as it's internal facing. It also improves the message in the
deprecation warning in the run command.

src/program/lwaftr/bench/bench.lua

@@ -31,12 +31,8 @@ function parse_args(args)
    function handlers.b(arg) opts.bench_file = arg end
    function handlers.y() opts.hydra = true end
    function handlers.h() show_usage(0) end
-   function handlers.reconfigurable()
-      io.stderr:write("Warning: --reconfigurable flag has been deprecated.\n")
-   end
    args = lib.dogetopt(args, handlers, "n:hyb:D:", {
-      help="h", hydra="y", ["bench-file"]="b", duration="D", name="n", cpu=1,
-      reconfigurable = 0 })
+      help="h", hydra="y", ["bench-file"]="b", duration="D", name="n", cpu=1})
    if #args ~= 3 then show_usage(1) end
    return opts, scheduling, unpack(args)
 end

src/program/lwaftr/run/run.lua

@@ -103,7 +103,8 @@ function parse_args(args)
       end
    end
    function handlers.reconfigurable()
-      io.stderr:write("Warning: --reconfigurable flag has been deprecated.\n")
+      io.stderr:write("Warning: the --reconfigurable flag has been deprecated")
+      io.stderr:write(" as the lwaftr is now always reconfigurable.\n")
    end
    function handlers.h() show_usage(0) end
    lib.dogetopt(args, handlers, "b:c:vD:yhir:n:",