LU-10499 pcc: command to remove PCC mirror component

LU-10499 pcc: command to remove PCC mirror component

This patch adds a command "lfs pcc delete $FILE" to delete the
PCC foreign mirror layout component.

Describe fields in lfs-pcc-state.1 and lfs-pcc-delete.1 page.

EX-bug-id: EX-4055
Signed-off-by: Qian Yingjin <qian@ddn.com>
Signed-off-by: Andreas Dilger <adilger@whamcloud.com>
Change-Id: I3f56fb8134bd1e7673ef8e04dff9b8482f0e32c3
Reviewed-on: https://review.whamcloud.com/c/fs/lustre-release/+/54457
Tested-by: jenkins <devops@whamcloud.com>
Tested-by: Maloo <maloo@whamcloud.com>
Reviewed-by: James Simmons <jsimmons@infradead.org>
Reviewed-by: Oleg Drokin <green@whamcloud.com>