LU-930 misc: update README path to git hooks

Update the README file so that the paths given to the git hooks stored
in contrib are current.

Signed-off-by: Olaf Faaland <faaland1@llnl.gov>
Change-Id: If864751d88ad54de629a1cda9d1ba6f2089ecd69
Reviewed-on: http://review.whamcloud.com/13428
Tested-by: Jenkins
Tested-by: Maloo <hpdd-maloo@intel.com>
Reviewed-by: Andreas Dilger <andreas.dilger@intel.com>

README

@@ -18,4 +18,6 @@ In order to improve the quality of patches submitted to the Lustre tree,
 it is possible to automatically check every patch and commit against the
 Lustre Coding Guidelines.  To do this, run in the top-level lustre/ tree:
 
-    cp build/{prepare-,}commit-msg .git/hooks/
+    cd .git/hooks
+    ln -s ../../contrib/git-hooks/{prepare-,}commit-msg ./
+    cd ../..