Portability changes for LUSTRE 2.4
LUSTRE/pNFS: This commit implements the support of pNFS for FSAL_LUSTTRE
pNFS/LUSTRE: invalidate attrs on close (force DS/MDS coherency). Think about something more subtle.
SQUASH ME
CMake: if CMAKE_BUILD_TYPE is not set, set it to debug. This prevent cmake to fail a few lines under in
cmake script from maintainer_mode.cmake