LU-5478 mdc: get rid of obd_* typedefs

LU-5478 mdc: get rid of obd_* typedefs

We have a bunch of typedefs for common things that made no sense
and hid the actual type from plain view.
Replace them with proper uXX or sXX types.
Exception is in lustre_idl.h and lustre_ioctl.h where
they are replaced with __uXX and __sXX to be able to be included
in userspace

patch 4 in series: modify mdc/mdt/mgc

Signed-off-by: Oleg Drokin <oleg.drokin@intel.com>
Signed-off-by: Dmitry Eremin <dmitry.eremin@intel.com>
Change-Id: I35b51c3e722f7463b7bab04a5fb2e19544b47178
Reviewed-on: http://review.whamcloud.com/13145
Tested-by: Jenkins
Tested-by: Maloo <hpdd-maloo@intel.com>
Reviewed-by: Bob Glossman <bob.glossman@intel.com>
Reviewed-by: James Simmons <uja.ornl@gmail.com>