Improve error reporting when virsh console is run without a TTY

If attempting to run

  ssh root@somehost virsh console someguest

You'll get an error

  2012-02-15 13:11:47.683+0000: 4765: info : libvirt version: 0.9.10, package: 1.fc18 (Unknown, 2012-02-15-11:48:57, lettuce.camlab.fab.redhat.com)
  2012-02-15 13:11:47.683+0000: 4765: error : vshRunConsole:320 : unable to get tty attributes: Invalid argument
  Connected to domain f16x86_64
  Escape character is ^]

There are several problems here

 - The actual error message is bad for users
 - We shouldn't rely on VIR_ERROR for this case
 - The prompt makes it look like we still connected
   because we didn't flush stdout.

* virsh.c: Flush stdout before starting console and check
  for a valid tty

tools/virsh.c

@@ -838,8 +838,14 @@ cmdRunConsole(vshControl *ctl, virDomainPtr dom, const char *name)
         goto cleanup;
     }
 
+    if (!isatty(STDIN_FILENO)) {
+        vshError(ctl, "%s", _("Cannot run interactive console without a controlling TTY"));
+        goto cleanup;
+    }
+
     vshPrintExtra(ctl, _("Connected to domain %s\n"), virDomainGetName(dom));
     vshPrintExtra(ctl, _("Escape character is %s\n"), ctl->escapeChar);
+    fflush(stdout);
     if (vshRunConsole(dom, name, ctl->escapeChar) == 0)
         ret = true;