merge and cleanup kernel patches.

Please don't reply to lustre-devel. Instead, comment in
Bugzilla by using the following link:
htt
ps://bugzilla.lustre.org/show_bug.cgi?id=11248



Some other things to cleanup:

- Old kernel tests in lustre/autoconf/*.m4.. some of them
check for features
that are no longer used in our code.

- From Andreas:
 <adilger> hmm, it seems fsprivate patch is maybe not
needed?
 <adilger> I can only see fs_private used in
liblustre

- The file_systems_lock export is now unused.

- From Andreas again:
   export-symbols - we might not even need them -
   check push_ctxt() for set_fs_pwd(), and
{libcfs,ptlrpc}_daemonize()
   for reparent_to_init()

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