LU-14689 hsm: starting running HSM coordinator should success

LU-14689 hsm: starting running HSM coordinator should success

When starting a running coordinator, the command should succeed
no matter how many times the command runs.

And this should be the same for stopping a stopped coordinator.

Signed-off-by: Li Xi <lixi@ddn.com>
Change-Id: I99169de35d6fcc11e03604ac63cdc4358e25b3d2
Reviewed-on: https://review.whamcloud.com/43720
Tested-by: jenkins <devops@whamcloud.com>
Tested-by: Maloo <maloo@whamcloud.com>
Reviewed-by: Andreas Dilger <adilger@whamcloud.com>
Reviewed-by: Sergey Cheremencev <sergey.cheremencev@hpe.com>
Reviewed-by: Oleg Drokin <green@whamcloud.com>