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.

Signed-off-by: John L. Hammond <john.hammond@intel.com>
Change-Id: I24a623b063c518755b81d02fc48fa0f76aacd318
Reviewed-on: https://review.whamcloud.com/30009
Tested-by: Jenkins
Reviewed-by: Andreas Dilger <andreas.dilger@intel.com>
Tested-by: Maloo <hpdd-maloo@intel.com>
Reviewed-by: Dmitry Eremin <dmitry.eremin@intel.com>
Reviewed-by: Oleg Drokin <oleg.drokin@intel.com>