net: +nm shouldn't provoke races

Brief version: otherwise DNS resolving might fail to perform
until dnsmasq service restart or system reboot (ouch!).

The problem:

1) NetworkManager requires dnsmasq;
2) dnsmasq can win a race against dhcpcd on ethernet.

The result:

1) /etc/resolv.conf looks fine;
2) dnsmasq is running;
3) resolving beyond /etc/hosts fails.

Suggested-by: Mikhail Efremov <sem@altlinux.org>

features.in/net/config.mk

@@ -1,4 +1,4 @@
-+nm: use/net/nm/nodelay; @:
++nm: use/net/nm; @:
 
 use/net: use/services
 	@$(call add_feature)
@@ -21,6 +21,8 @@ use/net/nm: use/net
 	@$(call add,DEFAULT_SERVICES_ENABLE,NetworkManager ModemManager)
 	@$(call add,DEFAULT_SERVICES_ENABLE,livecd-save-nfs) # keep interface up
 
+# NOT recommended unless you know what you're doing
+# (e.g. dnsmasq can win a race against dhcpcd)
 use/net/nm/nodelay: use/net/nm
 	@$(call add,DEFAULT_SERVICES_DISABLE,NetworkManager-wait-online)