LU-12734 misc: add bash completion for lctl set/get_param

LU-12734 misc: add bash completion for lctl set/get_param

Add some start of bash completion for lctl, mainly set_param and
get_param, and modify build system to install it.

Lustre-change: https://review.whamcloud.com/36105
Lustre-commit: f87a7f2656ceff174a00933a170032f093ecc72d

Test-Parameters: trivial
Signed-off-by: Dominique Martinet <dominique.martinet@cea.fr>
Change-Id: I16d2698e782702375c7fa3edf3bfde2e3b197297
Reviewed-by: Andreas Dilger <adilger@whamcloud.com>
Reviewed-by: Quentin Bouget <quentin.bouget@cea.fr>
Signed-off-by: Minh Diep <mdiep@whamcloud.com>
Reviewed-on: https://review.whamcloud.com/36483
Tested-by: jenkins <devops@whamcloud.com>
Tested-by: Maloo <maloo@whamcloud.com>