conf: Make -a/--address really imply --no-copy-addrs

I wrote it in commit message and man page, but not in conf()...

Note that -g/--gateway correctly implies --no-copy-routes already.

This fixes Podman's tests:

  podman networking with pasta(1) - IPv4 address assignment
  podman networking with pasta(1) - IPv4 default route assignment

where we pass -a and -g to assign an address and a default gateway
that's compatible with it, but -a doesn't disable the copy of
addresses, so we ignore -a, and the default gateway is incompatible
with the addresses we copy -- hence no routes in the container.

Link: https://github.com/containers/podman/pull/18612
Fixes: cc9d16758b ("conf, pasta: With --config-net, copy all addresses by default")
Signed-off-by: Stefano Brivio <sbrivio@redhat.com>

conf.c

@@ -1481,6 +1481,9 @@ void conf(struct ctx *c, int argc, char **argv)
 
 			break;
 		case 'a':
+			if (c->mode == MODE_PASTA)
+				c->no_copy_addrs = 1;
+
 			if (IN6_IS_ADDR_UNSPECIFIED(&c->ip6.addr)	&&
 			    inet_pton(AF_INET6, optarg, &c->ip6.addr)	&&
 			    !IN6_IS_ADDR_UNSPECIFIED(&c->ip6.addr)	&&