LU-10282 flr: comp-flags support when creating mirrors

LU-10282 flr: comp-flags support when creating mirrors

This patch will allow flags to be set when creating mirrors.
The flags are set to individual components therefore it would be
flexible to flags based on the location of components. Also, 'stale'
and 'prefer' flags are allowed to set to individual components later
on.

This patch also revises component flags matching rules to allow
flags and inverted flags to be set at the same time in the command
lfs-find(1) and lfs-getstripe(1).

Signed-off-by: Jinshan Xiong <jinshan.xiong@intel.com>
Change-Id: Ia077ca5454d49eb411bd82bd451c9dfc426d780c
Reviewed-on: https://review.whamcloud.com/30360
Reviewed-by: Andreas Dilger <andreas.dilger@intel.com>
Reviewed-by: Bobi Jam <bobijam@hotmail.com>
Reviewed-by: Jian Yu <jian.yu@intel.com>
Tested-by: Jenkins
Tested-by: Maloo <hpdd-maloo@intel.com>
Reviewed-by: Oleg Drokin <oleg.drokin@intel.com>