tmpfiles: silently ignore any path that passes through autofs (#6506)

If a path passes though an autofs filesystem, then accessing
the path might trigger and automount.  As systemd-tmpfiles is run before
the network is up, and as automounts are often used for networked
filesystems, this can cause a deadlock.

So chase_symlinks is enhance to accept a new flag which tells it
to check for autofs, and return -EREMOTE if autofs is found.

tmpfiles is changed to check just before acting on a path so that it
can avoid autofs even if a symlink was created earlier by tmpfiles
that would send this path through an autofs.

This fixes a deadlock that happens when /home is listed in /etc/fstab as
x-systemd.automount for an NFS directory.

src/basic/fs-util.h

@@ -81,6 +81,7 @@ int inotify_add_watch_fd(int fd, int what, uint32_t mask);
 enum {
         CHASE_PREFIX_ROOT = 1,   /* If set, the specified path will be prefixed by the specified root before beginning the iteration */
         CHASE_NONEXISTENT = 2,   /* If set, it's OK if the path doesn't actually exist. */
+        CHASE_NO_AUTOFS = 4,     /* If set, return -EREMOTE if autofs mount point found */
 };
 
 int chase_symlinks(const char *path_with_prefix, const char *root, unsigned flags, char **ret);