util: Rename and make global vu_remove_watch()

vu_remove_watch() is used in vhost_user.c to remove an fd from the global
epoll set.  There's nothing really vhost user specific about it though,
so rename, move to util.c and use it in a bunch of places outside
vhost_user.c where it makes things marginally more readable.

Signed-off-by: David Gibson <david@gibson.dropbear.id.au>
Signed-off-by: Stefano Brivio <sbrivio@redhat.com>

util.c

@@ -837,3 +837,13 @@ void raw_random(void *buf, size_t buflen)
 	if (random_read < buflen)
 		die("Unexpected EOF on random data source");
 }
+
+/**
+ * epoll_del() - Remove a file descriptor from our passt epoll
+ * @c:		Execution context
+ * @fd:		File descriptor to remove
+ */
+void epoll_del(const struct ctx *c, int fd)
+{
+	epoll_ctl(c->epollfd, EPOLL_CTL_DEL, fd, NULL);
+}