LU-7437 lctl: list_param -R can't work correctly

LU-7437 lctl: list_param -R can't work correctly

We shouldn't call lprocfs_param_pattern() inside listparam_display(),
otherwise it will add the prefix "/proc/{fs,sys}/{lnet,lustre}" each
time, so that the parameters can be listed recursively. The similar
issue in {set/get}param is fixed as well.

Also, this patch adds sanity.sh test_401 to verify this function.

Signed-off-by: Emoly Liu <emoly.liu@intel.com>
Change-Id: I21acec364cdbdfc025979153f66a87d44c9136e8
Reviewed-on: http://review.whamcloud.com/17223
Tested-by: Jenkins
Tested-by: Maloo <hpdd-maloo@intel.com>
Reviewed-by: Andreas Dilger <andreas.dilger@intel.com>
Reviewed-by: Bobi Jam <bobijam@hotmail.com>
Reviewed-by: Oleg Drokin <oleg.drokin@intel.com>