panic() cleanup.

this change
   - makes panic() variadic, doing full printf() formatting -
     no more NO_NUM, and no more separate printf() statements
     needed to print extra info (or something in hex) before panicing
   - unifies panic() - same panic() name and usage for everyone -
     vm, kernel and rest have different names/syntax currently
     in order to implement their own luxuries, but no longer
   - throws out the 1st argument, to make source less noisy.
     the panic() in syslib retrieves the server name from the kernel
     so it should be clear enough who is panicing; e.g.
         panic("sigaction failed: %d", errno);
     looks like:
         at_wini(73130): panic: sigaction failed: 0
         syslib:panic.c: stacktrace: 0x74dc 0x2025 0x100a
   - throws out report() - printf() is more convenient and powerful
   - harmonizes/fixes the use of panic() - there were a few places
     that used printf-style formatting (didn't work) and newlines
     (messes up the formatting) in panic()
   - throws out a few per-server panic() functions
   - cleans up a tie-in of tty with panic()

merging printf() and panic() statements to be done incrementally.

drivers/random/main.c

@@ -102,7 +102,7 @@ PRIVATE int sef_cb_init_fresh(int type, sef_init_info_t *info)
 
   /* Retrieve first randomness buffer with parameters. */
   if (OK != (s=sys_getrandomness(&krandom))) {
-  	report("RANDOM", "sys_getrandomness failed", s);
+  	printf("RANDOM: sys_getrandomness failed: %d\n", s);
 	exit(1);
   }
 
@@ -317,7 +317,7 @@ message *m_ptr;				/* pointer to alarm message */
 
   /* Schedule new alarm for next m_random call. */
   if (OK != (s=sys_setalarm(KRANDOM_PERIOD, 0)))
-  	report("RANDOM", "sys_setalarm failed", s);
+  	printf("RANDOM: sys_setalarm failed: %d\n", s);
 }
 
 /*============================================================================*

drivers/random/random.c

@@ -73,7 +73,7 @@ int count;
 	printf("random_update: got %d samples for source %d\n", count, source);
 #endif
 	if (source < 0 || source >= TOTAL_SOURCES)
-		panic("memory", "random_update: bad source", source);
+		panic("random_update: bad source: %d", source);
 	for (i= 0; i<count; i++)
 		add_sample(source, buf[i]);
 	reseed();