LU-5969 lustreapi: remove obsolete lctl dump_cfg code

LU-5969 lustreapi: remove obsolete lctl dump_cfg code

With Lustre having utilites that can read lustre record
logs from user space we no longer need the ability to
dump the log of recorded commands to the kernel dump log.

Signed-off-by: Andreas Dilger <andreas.dilger@intel.com>
Change-Id: I8b3b71ff394a1f81e4b2396449e0f6879c2b5623
Reviewed-on: http://review.whamcloud.com/15857
Reviewed-by: frank zago <fzago@cray.com>
Reviewed-by: John L. Hammond <john.hammond@intel.com>
Tested-by: Jenkins
Reviewed-by: Mike Pershin <mike.pershin@intel.com>
Tested-by: Maloo <hpdd-maloo@intel.com>
Reviewed-by: Oleg Drokin <oleg.drokin@intel.com>