net: Remove CONFIG_KMOD from net/ (towards removing CONFIG_KMOD entirely)

Some code here depends on CONFIG_KMOD to not try to load
protocol modules or similar, replace by CONFIG_MODULES
where more than just request_module depends on CONFIG_KMOD
and and also use try_then_request_module in ebtables.

Signed-off-by: Johannes Berg <johannes@sipsolutions.net>
Signed-off-by: Rusty Russell <rusty@rustcorp.com.au>
Signed-off-by: David S. Miller <davem@davemloft.net>
diff --git a/net/core/rtnetlink.c b/net/core/rtnetlink.c
index 3630131..31f29d2 100644
--- a/net/core/rtnetlink.c
+++ b/net/core/rtnetlink.c
@@ -1040,7 +1040,7 @@
 	struct nlattr *linkinfo[IFLA_INFO_MAX+1];
 	int err;
 
-#ifdef CONFIG_KMOD
+#ifdef CONFIG_MODULES
 replay:
 #endif
 	err = nlmsg_parse(nlh, sizeof(*ifm), tb, IFLA_MAX, ifla_policy);
@@ -1129,7 +1129,7 @@
 			return -EOPNOTSUPP;
 
 		if (!ops) {
-#ifdef CONFIG_KMOD
+#ifdef CONFIG_MODULES
 			if (kind[0]) {
 				__rtnl_unlock();
 				request_module("rtnl-link-%s", kind);