LU-7004 utils: remove "lctl conf_param" deprecation

LU-7004 utils: remove "lctl conf_param" deprecation

The "lctl set_param -P" functionality was intended to replace
"lctl conf_param" with a more uniform interface that matches
the existing "lctl set_param" and "lctl get_param" usage.
However, there are still unresolved issues that need to be
addressed and a longer transition period needed before the
old functionality can be removed.

Remove the deprecation warning for now, rather than bumping it
to some later release.  It can be re-added when "set_param -P"
has been fixed.

Signed-off-by: Andreas Dilger <andreas.dilger@intel.com>
Change-Id: If9a316bda4bf8d889c4072740f0879d9d43ebbe5
Reviewed-on: http://review.whamcloud.com/20573
Tested-by: Jenkins
Tested-by: Maloo <hpdd-maloo@intel.com>
Reviewed-by: Bob Glossman <bob.glossman@intel.com>
Reviewed-by: James Nunez <james.a.nunez@intel.com>
Reviewed-by: Oleg Drokin <oleg.drokin@intel.com>