LU-13040 lmv: Pool name string handling

LU-13040 lmv: Pool name string handling

KASAN picked up a case where pool_name may not be null
terminated.

There are a few cases where strncpy is used, however strncpy does
not guarantee the target string is null terminated. The preference
is to use strlcpy.

Cray-bug-id: LUS-8229
Signed-off-by: Shaun Tancheff <shaun.tancheff@hpe.com>
Change-Id: I414e955b5964c24b061edd76ed9e64a8985c537d
Reviewed-on: https://review.whamcloud.com/36908
Tested-by: jenkins <devops@whamcloud.com>
Reviewed-by: Andreas Dilger <adilger@whamcloud.com>
Reviewed-by: Ben Evans <beevans@whamcloud.com>
Reviewed-by: Petros Koutoupis <petros.koutoupis@hpe.com>
Tested-by: Maloo <maloo@whamcloud.com>