Refresh nodes when they're read from the start.

This is necessary for top, for instance, which keeps some files open and
re-reads them regularly. As an extra bonus we can drop the refresh hack.

* procfs.c, procfs.h: Remove the refresh hack.
  (procfs_refresh): New function, invalidates the cached contents.
* netfs.c (netfs_attempt_read, netfs_get_dirents): Call
  procfs_refresh when the read is from offset 0.
* proclist.c (proclist_make_node): Remove the refresh hack.
* dircat.c (dircat_make_node): Likewise.
  (dircat_get_contents): Use procfs_refresh to avoid keeping old data
  from the component nodes.

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