liblustre fixes and group lock support

r=phil

revert global namespace changes

r=phil

land b_cray_portals_merge on HEAD.  This consists of four families of changes:

1) Eric's work to change some APIs in Lustre's portals to come into line with
   Cray's portals and the spec.

2) add --with-cray-portals= to the build and use it to cut up the build
   when we're building lustre against external includes for Cray's portals.

3) Move some facilities from portals.o into libcfs.o so that Lustre can
   consume them when it is running against Cray's portals.o.

4) Fix up the liblustre build.  These changes have also made it to
   b_cray_delivery recently.

b=2939, b=2325, b=2059 (partial), b=2925, b=2399, b=2517

  arguments

Move changelog entry to a new block, since it's not part of 1.2.1.

r=zab (partial)

Better handling for OST eviction.  Fixes for clearing the page cache,
imp_invalid handling, and improved import_event interface. Also
includes the tests and fixes added from 2732; one of those tests does
not yet passed so it is excepted for now.

b=2936
r=robert

Skip closing files for the self_export, and add a test.

typo fix to have lbuild error on building rpms
removed erroneous EXTRA_VERSION manipulation

so that we don't have transaction errors on small MDS filesystems.
b=2931
r=tianying

r=shaver
let lustre could be mounted with the same name for node and mds

r=phik
Make mds_reint_create to use mds_lock_new_child everywhere instead of taking
the lock (and incorrect one) on its own.

Update ChangeLog.

Protect conn_cnt check and update with exp_lock in
target_handle_connect.

Add a test to replay since, and add an OBD_FAIL style macro to create
a race condition in a specific location called OBD_RACE.

allow lustre-kernel-2.4.spec to be built on ia64

Removed fsfilt_tmpfs.c from HEAD branch as it was got there mistakenly before its time came ;) This is because it was cvs add'ed before creating b_tmpfs branch.

Cleanups about readdir stuff. ext2_dirent and macros has moved to lustre_dir.h. Related chnages in llite and fsfilt_tmpfs.c