page-server: Convert opts.addr into char *

We'll have --address argument reused for library, so make this
abstract address, not ipv4 one.

Signed-off-by: Pavel Emelyanov <xemul@parallels.com>

include/crtools.h

@@ -40,7 +40,8 @@ struct cr_options {
 	struct list_head	veth_pairs;
 	struct list_head	scripts;
 	bool			use_page_server;
-	struct sockaddr_in	ps_addr;
+	unsigned short		ps_port;
+	char			*addr;
 	bool			track_mem;
 	char			*img_parent;
 };