delete plumbing code from nix boot.  unsure why it was there.

Reference: /n/atom/patch/applied/bootnoplumb
Date: Thu Jan  2 15:56:35 CET 2014
Signed-off-by: quanstro@quanstro.net

--- /sys/src/nix/boot/boot.h	Thu Jan  2 15:55:48 2014
+++ /sys/src/nix/boot/boot.h	Thu Jan  2 15:55:48 2014
@@ -33,10 +33,8 @@
 extern void	getpasswd(char*, int);
 extern void	key(int, Method*);
 extern int	outin(char*, char*, int);
-extern int	plumb(char*, char*, int*, char*);
 extern int	readfile(char*, char*, int);
 extern void	run(char *file, ...);
-extern int	sendmsg(int, char*);
 extern void	setenv(char*, char*);
 extern void	settime(int, int, char*);
 extern void	srvcreate(char*, int);
--- /sys/src/nix/boot/aux.c	Thu Jan  2 15:55:49 2014
+++ /sys/src/nix/boot/aux.c	Thu Jan  2 15:55:49 2014
@@ -2,57 +2,6 @@
 #include <libc.h>
 #include <../boot/boot.h>
 
-/*
-int
-plumb(char *dir, char *dest, int *efd, char *here)
-{
-	char buf[128];
-	char name[128];
-	int n;
-
-	sprint(name, "%s/clone", dir);
-	efd[0] = open(name, ORDWR);
-	if(efd[0] < 0)
-		return -1;
-	n = read(efd[0], buf, sizeof(buf)-1);
-	if(n < 0){
-		close(efd[0]);
-		return -1;
-	}
-	buf[n] = 0;
-	sprint(name, "%s/%s/data", dir, buf);
-	if(here){
-		sprint(buf, "announce %s", here);
-		if(sendmsg(efd[0], buf) < 0){
-			close(efd[0]);
-			return -1;
-		}
-	}
-	sprint(buf, "connect %s", dest);
-	if(sendmsg(efd[0], buf) < 0){
-		close(efd[0]);
-		return -1;
-	}
-	efd[1] = open(name, ORDWR);
-	if(efd[1] < 0){
-		close(efd[0]);
-		return -1;
-	}
-	return efd[1];
-}
- */
-
-int
-sendmsg(int fd, char *msg)
-{
-	int n;
-
-	n = strlen(msg);
-	if(write(fd, msg, n) != n)
-		return -1;
-	return 0;
-}
-
 void
 warning(char *s)
 {
@@ -160,14 +109,14 @@
 	if(len >= sizeof buf)
 		len = sizeof(buf)-1;
 
-	if(cpuflag){
+	if(cpuflag && *def != 0){
 		notify(catchint);
 		alarm(15*1000);
 	}
 	print("%s[%s]: ", prompt, *def ? def : "no default");
 	memset(buf, 0, sizeof buf);
 	n = read(0, buf, len);
-	if(cpuflag){
+	if(cpuflag && *def != 0){
 		alarm(0);
 		notify(0);
 	}