LU-8174 mdt: remove use of typedef mds_reint_t

LU-8174 mdt: remove use of typedef mds_reint_t

Replace the use of mdt_reint_t with enum mds_reint_op.

Remove the old mds_reint_t and mdt_reint_t since they were only used
in one place in the Lustre code and are unlikely to cause additional
patch breakage.  The majority of references are in wireshark.

Test-Parameters: trivial
Signed-off-by: Andreas Dilger <andreas.dilger@intel.com>
Change-Id: I3932db8e6dc9ac83325900d3f382c648ac57b8c0
Reviewed-on: https://review.whamcloud.com/27494
Tested-by: Jenkins
Reviewed-by: John L. Hammond <john.hammond@intel.com>
Tested-by: Maloo <hpdd-maloo@intel.com>
Reviewed-by: James Simmons <uja.ornl@yahoo.com>
Reviewed-by: Ben Evans <bevans@cray.com>