Land b1_4_smallfix onto b1_4 (20041216_1438)

Land b1_4_smallfix onto b1_4 (20041216_1438)
- add per-fs limit of Lustre pages in page cache, avoid OOM (4699)
- no transno return for symlink open, don't save no-trasno open (3440)
- don't try to complete elan receive that already failed (4012)
- free RPC server reply state on error (5406)
- fix ppc64/x86_64 spec to use %{_libdir} instead of /usr/lib (5389)
- unlock page after async write error during send (3677)
- return original error code on reconstructed replies (3761)
- no transno return for symlink open, don't save no-trasno open (3440)
- bump the watchdog timeouts -- we can't handle 30sec yet
- extra debugging for orphan dentry/inode bug (5259)
- clean up thread from ptlrpc_start_thread() on error (5160)
- minor changes from b_cray to reduce size of diff
- fix mount usage message, return errors per mount(8)