LU-8402 ldlm: assume OBD_CONNECT_IBITS

LU-8402 ldlm: assume OBD_CONNECT_IBITS

Clients and MDSs have supported and required OBD_CONNECT_IBITS since
before 1.6 so remove obsolete code to handle clients that do not
support this flag.

Lustre-change: https://review.whamcloud.com/30009
Lustre-commit: c7a833830de691967081cd7a42199b924ea7efdc

Change-Id: I9233bc3cdc5b4e2543c25e44e68acbecf77ff81d
Signed-off-by: John L. Hammond <john.hammond@intel.com>
Reviewed-on: https://review.whamcloud.com/30009
Reviewed-by: Andreas Dilger <andreas.dilger@intel.com>
Reviewed-by: Dmitry Eremin <dmitry.eremin@intel.com>
Reviewed-by: Oleg Drokin <oleg.drokin@intel.com>
Signed-off-by: Hongchao Zhang <hongchao@whamcloud.com>
Reviewed-on: https://review.whamcloud.com/34027
Tested-by: Jenkins
Tested-by: Maloo <maloo@whamcloud.com>
Reviewed-by: Andreas Dilger <adilger@whamcloud.com>
Reviewed-by: Oleg Drokin <green@whamcloud.com>