LU-10855 ptlrpc: remove obsolete OBD RPC opcodes

LU-10855 ptlrpc: remove obsolete OBD RPC opcodes

Remove the obsolete OBD_LOG_CANCEL (since Lustre 1.5) and
OBD_QC_CALLBACK (since Lustre 2.4) RPC opcodes.

Assign  OBD_IDX_READ an explicit opcode (as should be done with all
enums in lustre_idl.h) so that the value does not change if some
prior field is removed.

Also remove the OBD_FAIL checks that were used to test them.
The setting in conf_sanity.sh test_58 was unused for many years.

Test-Parameters: trivial testlist=conf-sanity
Signed-off-by: Andreas Dilger <andreas.dilger@intel.com>
Change-Id: Ie68c6be0da1c114fc981cb4b1afdcdb7c13ebbe5
Reviewed-on: https://review.whamcloud.com/32651
Tested-by: Jenkins
Tested-by: Maloo <hpdd-maloo@intel.com>
Reviewed-by: John L. Hammond <jhammond@whamcloud.com>
Reviewed-by: James Simmons <uja.ornl@yahoo.com>
Reviewed-by: Oleg Drokin <green@whamcloud.com>